YETI YETI YETI

That's the call of the yeti, leading the Necrolords' charge into Perdition Hold. He has resting roar face.
TRANQUIL MECHANICAL YETI, FULFILL YOUR DESTINY!

 

 EDIT TO ADD:

I don't know what this Sinrunner did in his past life that was so terrible, but I think this trip just wiped his slate clean.