OOC: Well, I was about to post the skill challenge rules, but you have already incurred in two fails, effectively ending it! (and loosing it)
The leader seems really intimidated, and before the heroes have time to react, he cracks something inside his mouth, and seen a white fume and goo starts drooling from his mouth, his eyes turn white, and he collapses, lifeless.
Searching the body of the dead leader, the group finds a letter, in an alien language, one none of them have seen before. Of that, the group can make out two things:
P-12 and G-27. The meaning of these numbers remains uncertain.
OOC: You can either find out the meaning of that by yourselves (it's not that hard), or make an Knowledge Dungeon. check to get some clues.