The Venom of Ssraeshza (Event Heroic)

First named : Rhag'Sekez Roaming on the south side.

You pull him and he starts casting some rune. You need to stop hitting it and wait for the color of the rune. - If it's a red one, it will kill anyone that attacks it. You need to bring the mob close to the blue rune that appeared so that his killer buff fades. - If it's a blue one, it's mana drain but you can still hit it with good mana regen. Bringing him close to blue will cancel the drain buff. Rince & repeat until it dies and don't forget the bulwarks :-)

Second named :

He will call for secondary colors, like "orange", after a while & become immune. You need to bring the mob to the 2 colors that make orange (hint : red & yellow) and his immune buff will fade after a while. When it does, 2 adds will spawn & you can dps it again. Rince & repeat until it's dead.

Third named : Apparently it's a puzzle, no solution here so far.