CALCULATIONS

Energy vampire does 6.25% true damage per pulse which scales with strength and viral stacks (4.25x at 10 stacks). Marked for death does up to 150% of the next damage instance to the area around the enemy. A strength breakpoint of 251% is required to cause 100% true damage to health at 10 viral stacks (6.25% x 251% x 150% x 4.25 = 100%). Therefore, priming an enemy with 10 stacks of viral, marking them for death then finally casting EV causes the first pulse to do 100% true damage to all enemies in range, one shotting them.

.