Pure Type. Pure damage ignores all armor and shields and deals precise damage (determined by base damage). It is also a spell so it does other effects such as silence and disable.
Just to make sure though....
*Uses Global Silence*
Global Silence: Stops all enemies on the map from casting spells!
-This is an ultimate spell. It cannot be blocked
-This spell interrupts channeling spells.
-This spell will mute all sound in the universe for the duration of the spell.