EHP calculation for mitigated hits with life gain on block is incorrect

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I'm running the latest version of Path of Building and I've verified this by checking the changelog

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I've checked for duplicate open and closed issues by using the search function of the issue tracker

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I've checked that the calculation is supposed to be supported. If it isn't please open a feature request instead (Red text is a feature request).

What platform are you running Path of Building on?

Windows

What is the value from the calculation in-game?

In pob, allocating certain life nodes causes EHP to decrease, despite increasing every ehp metric. I have narrowed this down to an interaction with how life gain on block is being calculated in the process.

If I remove life from my character, as expected the "hits before death" value lowers. However, at certain breakpoints, the "Mitigated hits" number increases. For reasons unknown to me. Despite every other value in the ehp calculation staying the same or decreasing.

What is the value from the calculation in Path of Building?

At 3323 life, 1609 es I see hits before death at 2.49, unmitigated% at 22% and mitigated hits at 11.96.
At 3102 life, 1609 es I see hits before death at 2.37, unmitigated% at 22% and mitigated hits at 12.65.

How to reproduce the issue

Load the pob pastebin below
Toggle discipline and training on/off - you should see odd ehp behaviour

In config toggle "Disable EHP gain when hit"
Again, Toggle discipline and training on/off - no odd ehp behaviour appears

This works with other life nodes, but NOT all. Certain life breakpoints seem to trigger the issue, while others do not.

PoB for PoE1 build code

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R9SMTP4FCe-ynXIdvRT1Sgi8EYJshKAbIVi5Y1BZ-GwgSh_xfscpmcHtQfny6ezzl6PBzUjoRRJpq-eCy7WSwWUW5WMuFwM_iAcRD8othm-1VOpvemd7uUg6eywT9dk3XWw3kPRWcuOKy-SpATcbwvqZVnJDnns19Dbj2W9zQ9nksVrymf9FbvldeCg3Gi9Cyg21K57qfbaKmWsRQ1SBMFODOAN9HBLYkJnA4GM0jiRAkUoFbmizOfi9HKG36F-XeqeSUW4ziaR0JBXQ7Tw1bmHEC-OVUs_zpnrWFHAnCuTv0o2VgbE9djUlsgUvarxrCrQTBbvJS6kiNQnWn8ScVtWkrG79WeZIahp2Jxrs78Ys7WgortJRcFnRnah0uKbsdKJsNTs6r_Y1Lbc_rQVLmamk2Z9a07pmhFB_Qk2LnBHCW3DUtOIZpY46Tv8ulWLB5v9MMWENhLURwt4I4WyEcDdCIHMzyGapos1iRWR5nNSDspivfIUcQ5RTqOnD4JhHxSicxobe4TbQPuutwZhVft4HnSsP10WxAA-_65omGbQcLQQIa9A8ELYMybIHX5Lox1QYZ4dvIT8LsYtN7vjcpqZFTY-4vhvygCBEqXAoDxjmSAgzsGlIAkswajqM-YRz5tEQghR0C2z86FEeBjBkpwdHXCbMEPG_pVkM6ZF62MzDHDwo9x9CTmYOyt2Sb4391_L_SSNJs0kzrOEBWKBcf5tLtMIsHRunAGIUcqOBwfOWv3BaZiv3JqijKIPfQ3mMYJqJ4F-viLncIF-5ynuXQQQtiSyGnAJvB7xXiLkL6Z46RCentoRhkV2kHhoTEJTejjxwm6Svi2miCKujWkZ19m7wu5_xsJAMI6IZlv2UgPOc54Pjqnd6AP5yLf1dyzJzJkvM-VAGFShoYIwGFxO59g5D0rQzsB0uAkw83zeRG2DP9ZhvMUu4yKM2IZhRX1guCjjnyHJdQn1CA9N0XAszi9st87Gs1eZz1TAeC7crHFWrYFuqDbWaFqLqHrl1IleqVBUtLmuppNpbUZoUxmtDvWrJkWQRcRd-njU3wHSFbVLUykvqM5yV6VZ2II-7ymQNvMJCM-AGjh6LjLdD9X-aHSzTYbpMh0U-0e7pRiRBmgzO07gAZ_pTOhndSmk39dn2Obc9T_gOc5AZOtzDhJvcdJkVQiDhLnc86ns29pknAogdxBEhodRERMizJO1wwGb6jHDb4SO0JJf_kotcz4MYxISYyTNVYKrtT1r3kNJyTFrpXpmQTSUl78koRlFunMieGSOwXIO0dTEF-0gfktr3yux_HQ2liZQqVWy0-j-shctGny2bQMnSNDBuIGTcDQ6yac4DiExqT1ydjGDkrklG0HwuQtnaXAQ11YmFgQku0RSWE7o8cIXleYzbATNd33ECxh3kMM8hfkBYCNmH46HAc3HAXYzhB2-7NMRG69KQlielba3UY700F6mHe8EpHmbpJDeu_RQ4lFVclk7B2T6MpFcbp_cAOVTHGyUKLrOCfEBIx5QDOQspxyvMZklCM6nBlno-Y7H546pUSD6fcVKd6i0dMqJd0pe_cpCXyUGspbNtx-k09tIsMfZFJu7-i0_S_P-pEZxE4LluHtLX10WaCONKTmI0rM_xbIdx1w4Dj2I_wG6I5QlHz7OYw5nt4TB0ECQuWNiW8LDlMxtTcP0Ot0OCQtZ25qhhN2BV7TlWpBVP-UepH8s0MC8TFSohCW050-WJCrbXZiOviNU0DTWjJHc0G0_pVE_yczAjaf3KqsZPQ6AWAtcFtGKIH9PonsdK1SWQkcIzDk4mAZ8DIUBhDH4fTwsuExJ9CZwmFEGYqtsoJ-SHRiC4vHdNzumA_yhGIsp0MQCuo9lX8AzQis-TJC0MTfbPYUDWasW1lyYeci_90diLwT9fpnGUj1S6GcnxKN1bOQMHOgQVYfllMQo5df1bRyGysSKm4NybxsAc6iI_9FHosBBSbyfwXTvAoUmoPN3MfDNkOECE0cCiUA17UOwhCF3EAyjKB9cjLqu6xaKXLY82V69PWiUvnV-XAD3x1dSe0v7yaox2Om7ZczNTJbRyvwMEyfrcszY6wstmO5cEGZn2L4knVhffX34o1V4p_ENlhJrPRnHL2m5isbj9K5LMR5Jl5uYsMbeT-GkyMuTlP4NLHvMgSqpIccqnnsju6oQP2Wumn2zbWZh-ApvYYG22C_bbTPx8yOGIoFiEdmD52EfMC-3QpR4UE0wwBtWwcEzXE54wA7BLGgiLBCY2BXIo5lvOP60ooE9k2qeSv_3mHJQzV5KYXSehFiJRe_6onMefn3QnrFvGRxuxtJW_2cuTProm6euWvtUGatNOLP5lpF2MdG49-3zv5OxgcC6CyK8M8_NUXkoaxdJ9QpGb35WJA1hsJlrTucIzTcyYx1wHhyykZii46VjMMv2QEajUkYt9xxShRUIrDFDgcGRavm-FOHR93rISt2UkjWKoHZ9qpfgidUG59PK-GSNTeVI4jWNVx8-imNx2C0mX7ouGngUDmR_Bj3PLW-1Z3Hb1YQRT7QTUPpwXUpllQ4XMZWOl7tlR7asrJmKVYbYHag88YJE-RklztEIEWYVvOo7rBcjDKLR9myIPvhMPhQE1Gcfg7lxqU8FoKO_FAccYQJ5h45Ai2vZppDFczRzcYu2VYQvcQKY3vRp7Y7mxpDJwKOO0BI0oN2TSmUFmdl8N6uySP92_SGarctt0hRSkQqN9noqpGJzIhS5wvuPxFFLXJzns-pZjI0wzw6kKXCMK9WyKLoQ1iPg3-I51w4yWxM1LqbPQqXxSxU1Db6mq4yVZEy4dky3kpjbaEC0h3XSbCuPZlu_5NnEh0IbypiNukzAQdoCs0ILM2OICNMpBoRUIhLlHAmYFTmi6jLkcBeSloyXES6M5TeLMTZOYu3j5zKy6qRDGXMXIEMJPK8f9kiRSz-oSSuoLrfUFFAiibHvxZsVq6itC2rt1sNsttC7ZrfMKm0vDajt33hg5MV6aPBykCcDpvRyttau_FnH-kAkUtGxR9lsqt7wmweBU8PsnY1_ErTlvgj0H0wCFLgtNSwgPXLBl-zwwuefwADsWGJvlWTzwuWsG3GeOB_lryE0uAh7aq6dJGJ3fima1t6IR3PyuFGym1K_0ZHelrfNZIlqRJTqrs8FZIcb-3NvWtpukQGRplPfkffky5ziM7qNE6BK2jvLXelantUjCkYucgAtuO45t-i6yw9BGtsm5SR3qsCBA3LTl9XYmcnwM3pr5lJnEs03XRKS96NeYrG5lY2Y7vDNzTXhH7dqiXtqQyz4KEzpSP-QT-SYIcDyJVIsifloW0tWLFqT6rAvqFdAyAgdplk0n0vOBy0yDtXS4SjT0yssc3p96N6VikfZUuqamQbz3MBcmCQJs2ZDfSz8UgkqFPmQMAoUepI2hXLNDFFIG3watE8S3bHm_oifC1bsz8DpVQ3-cqv1Pro8htrQi43nqj8BFVlXZ9ZKCDFIKyAzjOG0HDsogSWMuQUwgED6HhJ9YtmVDEAl87GHqeK5jCfg5cEMUuJZv-gSKAc9yQ8tfmY21_IC9TVmmFrJw_Utdg0FdKbMsaWg8Kae4mbUkefq3VV7Wyg3GN3zc3lY8v75huyL0MXIYtwRjtmNhaoO_DUNsUwKFlgWOmtiYY0pFaErXjIVnUweDbQSej9t-mDSEThbWN3SSKDd7zk61NectX2G6AUKSmOXCx5kQv4lhufQgA3-5EkBbozEjVS0eRJAnqNkotVASxfJnlUoP1OgXTxOhjq7UiCWMzK_1eP_v8ahLFWLZUsKn6diTi9iTwZ64hQL1ZhovbF1w5WWcNqOCYmbahPkBlFlBYDoWDWgQuiHH2DJDguEnALUt4khtESaXl5Ja4cpJfdYufl6xDQPd3sVwqatraUzXUP_F8uaOQTURvmLH7-x1TaA1rTpkpkAhJLRy_8x9JCf1Jflv6di7jcIi37ghorXgq0_HlLX-4VSf0RwsY3sZwdne19x4hWvJ1EnrUgk9UwOfp1_OSodTTfPAKExvb2MxuEieHqvzJs2ozK3AdaBACIntOjYWPmR71PI87tvcA-WjiItQWEQEhISmoL5874jNEOLccXx7y3K9NfmD2kpZeodLkYhCRuJc7mJYWgO0d3itmKp-RfHcmZm54zGv9CruWVIIyGNuxeJcc0n5EAShxnxOx_N6KfYczOw2kZunz3mg1CySFybCcMxJBHQuSCEkAOhAr7yW8wjFiJeaLc0K8sxY3juoUyo9q1CRnBN8k-J_QPmzbNGIQ_p9EkfjMfgaOTcNNnsQT9XJOH2Kp7mEiu0Q0hvbpxA_iR14jvB8F1Igz2EoNG3sW9hlUDJ7QmC5odgjluP5duDKa5Qpam_SsVZmoGSW5KgdA9Rob72f_YwMAJD7CJu_y2HlmntDT2q16EmXN5Y-am4_v3JiEOxbznG2ZD9XpnBDH1YcrKE4841goq0cS-1v0Cug9dbIdY2s7Kf-PXtaDXEt4vD18TQOI_VWOBkyJiPhP_0HKDw2tz-81kwsXAsqL4HNQBDKOAwVDj1GfeLI268JQraN_JBwxzUJh9jgYg8JyPm55wSmb7vziUXns17PPubTZYjnBCfv-115lLN1EXCc6huTL70vVx_lsdNEvQ5U7S009rynPOeV_anbqsrLleuTG6sIVLd0ztOwetBoXNgzT4b2ZwUb1w98Mk8IvQw_7KX4wS_Dj_VS_JAehPSCy3MkrKv1hgwQ7YbSYBOx7fjEvflsKCHqbBAzHLIJReesjUacTRj1FdzVHehdx36GYndWl2fIr77toOoZ2qzr-gLQEmHjGMtZhqawrU4ITc3rhkG2MbRnOLPluvsSXLAXoGE9uye0txU2BhmR7Rrt03VdMDcapdu12UdU2qyfF7qWxHP0bBbwtmHm2S2T3kPWtG17u0bpcyVOn91v9lwW2LNZsJ7LgrVNHvns5E3ExR-U_OFnsoFfSh7PZYQ8E58-E589E3-pYqmfzgJAniPTeolMSVXPNzTfK9O7wiEvo1Rkm77o99y0-tJ69U3fvtAXqPj6DmrDTeNe1tA7c2hw5j5jpNALCAm_VL32EiOGXsofvVgVyl6Koxer018shtGXIvQSNcCWvmuG5Wzb8rOT2UXW9ZyYvvtMvkWSB-JavRTzm5DzhuX7v9S7Octb5eQFb4Z-p1brTafGg8KQC3ryLapm3cBSorpd9Um9zFKuDj_sBfdy4eYmTePmC8HkeVK1VAfVfhzvyK0WIglar79UF9jpmb1kMi2MZCovUFNvVtHiUFfI_aIfl4xpSA8aEzypbqAroYEZfTF_CzYv5JLK-52j4-Ojg5uzr0cV_DjK_V-8aRiey_vqNMq1UC9ENvw0jvkkFzXDRj71cv3j-52vkXhQk56HouBRnOuZx_JCOnl5Vi9qCu80KvSkqKY1-9qH0tGjyOQx3m8wbFkkSr7qb72Z0izIrTLyxa2a2mHar3d6LUEuI6i3g2tJyfWEXlTk6lzZHfmxF-7ZeMLjsuXyc29JyG0L-UT4URj50q6aQy7fS6ef9ZKL708z7j_V491643Q3Gmp_myagP_ZB1jveNXb5uZdU1XaQUqr6cx_0Q-Hzsu_6Yx_k-oXzaQKC01TqZ70ofUr1-4XAaKq9KprcUSzqB30IXsgb18t39mpK5-Bmqgc9Dae8tE3TaXzvJasoLEdJfeqDqu8mV32Qn3p5osb5glKgzSd9SMkTg7Uj64eqtxWU8mu9drzjEFQ5QFB_7iUEfaC17H_5pZeR6JcF3KdRoHyDNpe5h_0cRipfEvJcModpcPsC3KizwNXB4lpQz6Goqp9yvMvPK9HLy2sb2F-KSO6oeh4RaWXPoyCN7XkUbqJEHd7YmsBVnYhcrc1BFjGrl8TrUN16Y3wn_Prd8VtT0HeWb41evhO0E_Yq_19tKpoFgPpJL21OIZuDhKN8K8GzaMkDQtXmuT6kFgWkejjnk55HS8fZFxJa63WBM3-iH_QmBHnBaZ15bktJR__oXpwKHhejSyhenkewvKMWOOvbzyWmLvx0OuFJUFG7aKf720oPClkguj-N4uBQ3kCYP4tLtTN4HZ13b6pq8t1BmoTRbXkFuP5SXgKu2quftLaLtCtQeYW_LhLlNpNI8qA2QpcX7r9p4iytRWs0xfj-NJObeNp4VV1qdN4rqHbJl7vjn-R0XbndrG50mhfpGKrZvN1S1StcV771_l3If8uzD9XrDgtQCCGPQmygoV7BlKvqbiSCm1S_D2JpD_fiKOMVnselZPqIEHq8_yTPJuoxX85f3dbHj3VLUNrLwY6nj32aKy_SUf1Z3laHES-PkgZ9EMurgLZuuHybVF_8aS7qoNuKeD1GR57yWzc6HUjUm4HX0am0sF4J0O800LrYe5Cq129txpOq1HzzVN-WyqGt8C5j7osRaDRYdj3pVa_UCIkhJdqsWJYjoQpHNXCtX863rpFWG3ImpTnr0Imxepw2c4cxRQudak5rLUcj5gKXm5Ec2uZS7mZcKzkTUdJCaRVoG8SdN942D1JvmMwyNAu5jttqq1lMrhDCguAuRdJjmKS_3DxCZAFnQytkuS5swEJsMfJ8i2TuJwKltAfyEJ_cCbx2iGcLgJpdeex-s2YsaOEslKxDs822QBtzlh3bmfNo6xtrYZYuEBIitTW2k0X7Oq2ZQH6S8fgmuhWZkmovlqsNups5pjXHk_qO3MPyDEc3j6Xuo9zsshq6I2LRqY15ByL1pDX786bOAXXmqL7JjzeZEHJy3_gtTcc_g8qZeJfIm9oIMYkp3_iuVkSui0yu2Uign8C8XWfXpg5xHOxgjNe9UUahfNQv0tELSu8-pYVQiyCSk_LLuzeXvBhdhCp7BgX6x-D_A4snBH0=

Screenshots

this is the odd behaviour. ehp decreasing when adding a life node that should be strictly an upside

I did some local debugging, the issue seems to be with how the numberOfHitsToDie function is handling life gain on hit when accelerating its calculation.

I commented out the speedup block to force the function to individually apply each hit and the outcome was more expected, note when I toggle "Disable EHP gain when hit" the EHP between the accelerated calculation and forcing each hit to run individually is the same, so it is something caused by GainOnHit.

I suspect it is something to do with the formulas in this code block, which would only be hit when running recursively for speed up

PathOfBuilding/src/Modules/CalcDefence.lua

Lines 2599 to 2611 in a51cdca

    
           if (DamageIn.GainWhenHit or DamageIn.MissingLifeBeforeEnemyHit or DamageIn.MissingManaBeforeEnemyHit) and (iterationMultiplier > 1 or DamageIn["cycles"] > 1) then 
        
           	local gainMult = iterationMultiplier * DamageIn["cycles"] 
        
           	if DamageIn.MissingLifeBeforeEnemyHit then 
        
           		poolTable.Life = m_min(poolTable.Life + DamageIn.MissingLifeBeforeEnemyHit * ((output.LifeUnreserved or 0) - poolTable.Life) * (gainMult - 1) / 100, gainMult * output.LifeRecoverable or 0) 
        
           	end 
        
           	if DamageIn.MissingManaBeforeEnemyHit then 
        
           		poolTable.Mana = m_min(poolTable.Mana + DamageIn.MissingManaBeforeEnemyHit * ((output.ManaUnreserved or 0) - poolTable.Mana) * (gainMult - 1) / 100, gainMult * (output.ManaUnreserved or 0)) 
        
           	end 
        
           	if DamageIn.GainWhenHit then 
        
           		poolTable.Life = m_min(poolTable.Life + DamageIn.LifeWhenHit * (gainMult - 1), gainMult * (output.LifeRecoverable or 0)) 
        
           		poolTable.Mana = m_min(poolTable.Mana + DamageIn.ManaWhenHit * (gainMult - 1), gainMult * (output.ManaUnreserved or 0)) 
        
           		poolTable.EnergyShield = m_min(poolTable.EnergyShield + DamageIn.EnergyShieldWhenHit * (gainMult - 1), gainMult * output.EnergyShieldRecoveryCap) 
        
           	end

And this is the block I comment out to force each hit to be calculated individually

PathOfBuilding/src/Modules/CalcDefence.lua

Lines 2631 to 2653 in a51cdca

    
           -- to speed it up, run recursively but accelerated 
        
           local speedUp = data.misc.ehpCalcSpeedUp 
        
           DamageIn["cyclesRan"] = DamageIn["cyclesRan"] or false 
        
           if not DamageIn["cyclesRan"] and poolTable.Life > 0 and DamageIn["iterations"] < maxIterations then 
        
           	Damage = { } 
        
           	for _, damageType in ipairs(dmgTypeList) do 
        
           		Damage[damageType] = DamageIn[damageType] * speedUp 
        
           	end 
        
           	if DamageIn.GainWhenHit then 
        
           		Damage.GainWhenHit = true 
        
           		Damage.LifeWhenHit = DamageIn.LifeWhenHit 
        
           		Damage.ManaWhenHit = DamageIn.ManaWhenHit 
        
           		Damage.EnergyShieldWhenHit = DamageIn.EnergyShieldWhenHit 
        
           	end 
        
           	Damage["cycles"] = DamageIn["cycles"] * speedUp 
        
           	Damage["iterations"] = DamageIn["iterations"] 
        
           	iterationMultiplier = m_max((numberOfHitsToDie(Damage) - 1) * speedUp - 1, 1) 
        
           	if iterationMultiplier == m_huge then -- avoid unnecessary calculations if we know we survive infinite hits. 
        
           		return m_huge 
        
           	end 
        
           	DamageIn["iterations"] = Damage["iterations"] 
        
           	DamageIn["cyclesRan"] = true 
        
           end

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EHP calculation for mitigated hits with life gain on block is incorrect #9446

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	if (DamageIn.GainWhenHit or DamageIn.MissingLifeBeforeEnemyHit or DamageIn.MissingManaBeforeEnemyHit) and (iterationMultiplier > 1 or DamageIn["cycles"] > 1) then
	local gainMult = iterationMultiplier * DamageIn["cycles"]
	if DamageIn.MissingLifeBeforeEnemyHit then
	poolTable.Life = m_min(poolTable.Life + DamageIn.MissingLifeBeforeEnemyHit * ((output.LifeUnreserved or 0) - poolTable.Life) * (gainMult - 1) / 100, gainMult * output.LifeRecoverable or 0)
	end
	if DamageIn.MissingManaBeforeEnemyHit then
	poolTable.Mana = m_min(poolTable.Mana + DamageIn.MissingManaBeforeEnemyHit * ((output.ManaUnreserved or 0) - poolTable.Mana) * (gainMult - 1) / 100, gainMult * (output.ManaUnreserved or 0))
	end
	if DamageIn.GainWhenHit then
	poolTable.Life = m_min(poolTable.Life + DamageIn.LifeWhenHit * (gainMult - 1), gainMult * (output.LifeRecoverable or 0))
	poolTable.Mana = m_min(poolTable.Mana + DamageIn.ManaWhenHit * (gainMult - 1), gainMult * (output.ManaUnreserved or 0))
	poolTable.EnergyShield = m_min(poolTable.EnergyShield + DamageIn.EnergyShieldWhenHit * (gainMult - 1), gainMult * output.EnergyShieldRecoveryCap)
	end

	-- to speed it up, run recursively but accelerated
	local speedUp = data.misc.ehpCalcSpeedUp
	DamageIn["cyclesRan"] = DamageIn["cyclesRan"] or false
	if not DamageIn["cyclesRan"] and poolTable.Life > 0 and DamageIn["iterations"] < maxIterations then
	Damage = { }
	for _, damageType in ipairs(dmgTypeList) do
	Damage[damageType] = DamageIn[damageType] * speedUp
	end
	if DamageIn.GainWhenHit then
	Damage.GainWhenHit = true
	Damage.LifeWhenHit = DamageIn.LifeWhenHit
	Damage.ManaWhenHit = DamageIn.ManaWhenHit
	Damage.EnergyShieldWhenHit = DamageIn.EnergyShieldWhenHit
	end
	Damage["cycles"] = DamageIn["cycles"] * speedUp
	Damage["iterations"] = DamageIn["iterations"]
	iterationMultiplier = m_max((numberOfHitsToDie(Damage) - 1) * speedUp - 1, 1)
	if iterationMultiplier == m_huge then -- avoid unnecessary calculations if we know we survive infinite hits.
	return m_huge
	end
	DamageIn["iterations"] = Damage["iterations"]
	DamageIn["cyclesRan"] = true
	end

EHP calculation for mitigated hits with life gain on block is incorrect #9446

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PoB for PoE1 build code

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cscullen commented on Feb 2, 2026

MichaelB113098 commented on Feb 22, 2026

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