The rules state that the Mumak cannot enter difficul terrain (i always place multiple trees on a base, and the base counts as difficultt errain) but it also says about an optional rule that you can trample the terrain. So am I correct in saying if you agree with the optional rule, then you can move through trees (and may destroy them) but if you dont play with that rule, you cannot move through trees at all?

I'm guessing this is for SBG?

I swear, one of these days I am just going to start answering every unidentified question as if it were WotR.

It is SBG. And yes this is correct. It's a rule that's not used in tournaments, like loose mounts, but if you and your opponent agree then you can use it however you wish.

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Coordinator of the Great British Hobbit League

Ok thanks, sorry for not identifying the topic.