It's Killing Time Gold
After casting your Ultimate, mark all enemies and store 40% of damage you deal to them. After 5 seconds, detonate the stored damage (8 second Cooldown).
Damage Dealt: —
Damage Dealt: —
— marks a value the game fills in during a match: it depends on your stats or counts what happens. Your in-game tooltip shows it.
Patch 16.21 (PBE) — test-server data, may change before release. Text and values from the game files via CommunityDragon (16.21.8264391+branch.main.content.beta).