5-8% Strength for 4.5s on Kill. Stacks 5 times.
Up to 5-20% Strength based on the charge time of your heavy attacks. Stacks 3 times.
Immune to Ranged Attacks for 0.6-1.2s on Weak Spot Hit.
10-16% Toughness on Critical Hit Kill.
I feel like it is better to approach wounds zealot as a tank rather than a damage dealer. You certainly can do damage but it's not the end goal.