Guild Wars 2

What I mean by that is not can you put bleed, poison, and burn on someone at the same time. Of course you can do that. But what I want to know is if you hit someone with burn. Then burn again before the first burn wares off do they stack and start ticking away life twice as fast or does it just reset the timer?

See: http://wiki.guildwars2.com/wiki/Effect_stacking

Stacks in Intensity – Bleed/Confusion/Vulnerability

Stacks in Duration – Everything else.

Apply 5s burn, apply another 3s burn = 8s burn.