Time to rock your world (obvious pun, cue facepalm).
Quarry and Razorfist's companion, abducted like them and spliced with a creature from dimension x, this time a rock soldier. That's about it.
TRAGG AND GRANITOR
Two rock soldiers who are Ch'rell's bodygaurds, pretty mindless and only caring to protect their emperor. Traag can control fire while Granitor can shoot and manipulate the crystalline structures on his body. Even if the turtles get past this two, they would face Ch'rell's fury head on.