Most sources describe Overpower's Lord of Hatred-era redesign as a stacking buff capped at 4 stacks (4 seconds each, 15%[+] Additive Damage per stack); a directly-fetched page from another guide states the cap is 8. Regardless of the true baseline, current top-tier Season 15 builds push the effective cap far higher via specific Aspects/uniques.
This is an unresolved, live disagreement between reputable sources rather than a settled number - do not build a damage calculator assuming either figure without testing in-game. What is NOT disputed: individual Overpower stacks each carry their own independent 4-second timer, and certain items are explicitly designed to push the practical stack count well past whatever the 'baseline' figure is.
Sources agree the mechanic is now a simple stacking Additive-Damage buff (replacing the old percent-chance/crit-like hit-type from earlier expansions); they disagree only on the numeric baseline cap.
Baseline cap: 4 (one guide-derived) or 8 (another guide fetch) - disputed. Per-stack value: 15%[+] Additive Damage, each stack lasting 4 seconds independently.
Test your own build's actual max Overpower stack count in-game rather than assuming a number from a guide; if your kit includes a stack-extending Aspect (see season15_ritualist_overpower_extension), the baseline dispute barely matters since you'll exceed both figures anyway.
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