Words of Power

Target a Grey Knight unit within 6 inches of this
Priest
Whenever that units makes an unmodified melee
wound roll of 6 they assign an additional wound.
If Tides of Convergence is active, they assign an
addition mortal wound as well.
(Tides of Convergence still applies a mortal wound separately. Totaling 2 mortal wounds per roll of 6)