But I know what you're thinking: when do we get characters that can deal 60 CON damage per turn? Well, here it is. This is possibly the lowlight the system right here. It demonstrates everything wrong with the soon-to-be GM's system. He doesn't understand how attacks are supposed to scale. He doesn't understand what the CON stat does. He doesn't know what an attack of oppurtunity is. And he most certainly did not pass grammar school.
Let's do the math out. Assuming full BAB progression, you get three attacks per turn at level 11. Assuming you were competent in melee, at that level, you could deal 33+3d4 CON damage in a single turn without saves. Hell, even at level 6, that's still 12+2d4 CON damage, enough to kill nearly anything that moves. This limits actual threats to undead, constructs and pretty much nothing else. Need to kill all tension in a campaign? Play this race.
And yes, the stat block is unfinished. He thinks this race needed to be made more powerful.