Guild Wars 2

jsut take a look that the guild wars 2 wiki:
http://wiki.guildwars2.com/wiki/Death_Nova

You cant see the cooldown though. You cant see cooldowns for any trait activated skill either. Only cooldowns you can see are the ones that are in your skill bar.

it gives 1,5k-2k dmg depending on ur cond.dmg. stats AND IF the enemy eats the whole thing. and cz posin only stacks duration this means it takes 15 sec. its not a burst skill,
so its not worth it when ur dead.

a far better choice are runes which give u invunarability at 10-20% which MAY prevent death in first place, or the trait which fears on down combined with terror

I prefer runes of the undead. Dirt cheap and work wonders with full rabid gear and conditions.

If it works exactly like the trait, it does no direct damage at all.
In regards to poisons damage component see flumeks post.