The ability isn't all that if you think about it. Even if Nightsister Initiate (character with highest max health, at 18,878) was at 25%, that means she'd have 4719 health. A lot of characters can do that much damage at max level. The only great part is that the damage is unavoidable.
Right, it could be 9999999999 and it would be the same effect, there's no bonus for overkill and he doesn't have any HP Steal.
As dkredsox says, ~5,000 would do it (there are leader HP buffs and uniques like Royal Guard, but still about 20,000 HP is max). For PvP...there's exceptions in PvE bosses that probably hit 50,000 in the challenges.
Either way 9,999 would cut it across the board, I'm sure. Any other digits beyond that are completely useless.
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As dkredsox says, ~5,000 would do it (there are leader HP buffs and uniques like Royal Guard, but still about 20,000 HP is max). For PvP...there's exceptions in PvE bosses that probably hit 50,000 in the challenges.
Either way 9,999 would cut it across the board, I'm sure. Any other digits beyond that are completely useless.