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http://www.youtube.com/watch?v=goroGtokaxYSpecial lines at 7:45 (these lines are said normally by transformed Gulcasa)
It is actually possible to kill Gulcasa before he even transforms, which results in some special lines and victory conditions. However, he transforms anyway (lol) and the game doesnt really seem to acknowledge it very well after that.
Also note how Roswell gets teleported off the center fort so Gulcasa can take that square, heh.
Also, Gulcasa keeps the same morale between his initial form and transformation, but gives way more XP on transforming.
[13:27:43] [Sabator] peter would be the worst batman ever though. "turn on the bat-signal" "right!" *turns on huge foglight, beams an image of striped pantsu into the sky*