Tried on the arena dummies many times, despite having skeletons, rogue’s damage is always the same.
Tried with 4 points on the skill and without points on the skill. With 1 - 5 warriors. With 1 or 5 rogues. Damage is always the same consistently, in my case 30k each rogue with basic attacks.
Please check the skill, for some reason is not working at all.