[Research] Server-sided vs Client-sided Skill Cooldown Times

So I've bypassed skill cooldown times (easy enough) but skills are validated server-side. Your mana will decrease and you will perform the skill, but no damage is dealt.

"Your mana will decrease" <- sounds like mana is clientside then O:

Eh most likely not. What I think happens is the client knows how much mana a skill is going to take, deducts it client side and then triggers on the server a skill has been performed, and then the server deducts it, performs the skill, and calculates damage (since even if you perform a skill really fast, it only deals damage every few times; just like if you didn't bypass cooldown times).