2fc7bb06_UO_Player_Guide___Spellweaving__Effect
[Spell] Word of Death Nyraxle [Secs] 3.5 [Mana] 50 [Skill] 80 [Effect] 
Attempts to deal a massive amount of damage to a target, but is only successful if the creature is below a certain percentage of its max hit points. When the creature is not below this threshold, the damage will be minimal. The hit point threshold depends on your arcane focus; with no arcane focus, the creature should be at 5% health before the spell is effective. Each point of arcane focus strength increases the threshold by 5%.
ABCUO Player Guide - Spellweaving
Effect