Rancor

ASK FANTASY FLIGHT 

Q: Can I use this event to cancel the Rancor's (Core) "forced" reaction?

A: "Forced" is just a modifier. The Rancor's (Core) ability is still considered a reaction, and may be canceled by Over My Dead Body.

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Q: If the Rancor and Wittin is in play, along with some higher costed units, what happens with the Rancor's reaction?

A: If Wittin is committed to the Force, he cannot be chosen (as he cannot be destroyed). If there is another eligible unit at the same cost as Wittin, it must be chosen. Higher cost units, however, do not qualify as “the lowest cost non-Vehicle unit in play.” (As Wittin has a lower cost than them.) So if Wittin is the only 3 cost unit around, it will prevent the higher costed units from being destroyed.