need help with single player *Big spoilerific monster*

[kilergiant]

im up to the part where the rancor has green spikes or something and i got to find a way to kill it and i can't seem to figure it out can someone post and let me know how to beat it

[PG|Prometheus]

dont kill it, run and you'll find some ingeneous, mutated rancor sized door to crush it with :P

[Prime]

Didn't you see Return of the Jedi?

[Darth Kaan]

Here is another hint, look for the third large room....

[Crow_Nest]

Dont bother about the dark jedi, let the rancor eat them while you locate and activate switches.