On-hit healing turns contact into boss recovery. The contract is the qualifying predicate: a clean miss does nothing, a blocked strike may count at zero damage, and one contact creates one heal event. The boss health change needs a visible source, a cap, and enough recovery time for the player to answer.
Kern fixes a 96-unit strike zone at 0.30 s. Tavi clears the whole circle before 0.98 s, so the contact predicate is false and Kern remains at 48 health.
Autoplay is disabled by reduced motion. Scrub across 0.30, 0.86, 0.98, 1.82, 2.64, 2.88, 3.34, 4.04, 4.68, and 5.34 seconds to inspect the miss, blocked contact, bounded heal, second miss, counter, and reset.
Define qualifying contact, block and parry treatment, damage dependence, requested and applied healing, overheal, per-target and per-swing de-duplication, multi-hit cadence, summons, immunity, phase transitions, rollback, and telemetry that connects each heal to one contact id.
Write one authoritative predicate for hurtbox contact, blocked contact, parry, armor, invulnerability, summons, projectiles, damage-over-time, and environmental proxies. Do not infer healing from animation overlap or from a damage number that may be zero.
Calculate requested healing separately from applied healing, clamp at maximum health, and decide whether the amount is fixed, proportional to damage, or scaled by phase. Give every swing-target pair a stable result id so duplicate callbacks cannot heal twice.
Connect contact to the boss with shape, motion, sound, and a health-bar pulse. Keep dodge, parry, interruption, spacing, or healing reduction useful, and leave recovery long enough to punish a failed attempt.
A boss that heals on a whiff teaches that spacing is irrelevant. Resolve the heal from the same authoritative contact record used by combat, and log the contact id, target, request, applied amount, and rejection reason.
Rapid attacks, overlapping hurtboxes, summons, and rollback can multiply recovery into a runaway reset. Define per-swing or per-tick cadence, deduplicate target pairs, cap the gain, and test low frame rates and latency.
Store contactQualified, damageApplied, healRequested, healApplied, and resultId as different values. That makes blocked-but-healing attacks explicit and lets balance change without rewriting collision rules.
Compare average player damage per opening with average boss recovery per successful contact. Bound the worst case across long combos and summons so one mistake increases pressure without erasing several clean cycles.
Track eligible contacts, misses, blocked contacts, damage-zero heals, requested and applied healing, overheal, duplicate suppression, heal per minute, deaths after boss recovery, and phase duration.
The blow leaves Tavi unharmed, but a thin stream of runic light runs from the guard into Kern’s cracked chest. The elemental closes one fracture, making the exceptional block rule visible before the next exchange.
Pair a tether, inward motes, a distinct heal sound, a boss-health flash, and text or icon feedback. Offer reduced healing, blocked-hit immunity, longer cooldowns, stronger healing reduction, or a mode where only damaging hits qualify, and state the chosen rule before combat.
On-hit healing requires an eligible boss contact with a target. Self-healing begins from a timer, phase, or boss action without that contact, while resource steal changes ownership of another value. Keep those event sources separate even when they share the same green effect.
At 3:14, Erika’s Tangela uses Giga Drain. Damage and recovery are one authored move result, so the interface must connect the struck target, the drained amount, and the user that receives the health instead of presenting an unexplained green number.
Malenia restores health when her attacks make contact even through a shield that prevents damage. The exception is a strong reminder to model qualifying contact separately from damage applied and to signal that blocking changes the cost rather than cancelling the boss result.
At 0:30, the guide isolates Anub'arak’s Leeching Swarm: periodic damage to the raid is converted into boss healing. Because the amount depends on current player health, the encounter turns party health management into a shared control over the boss’s recovery rate.
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