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Yah Vine Shield is def. MR based.

I made a troll king with 30 MR hit an opponent with vine shield for 50 rounds.

He never got entangled even once.

I made him strip down to naked and hit an opponent with vine shield for another 50 rounds.

He got entangled a couple times (Troll King = 17 MR, which is still pretty good).

So the high MR units don't have to worry so much about vine shields.

Good to know, I guess some other shields are useful after all, although vine is still the most broadly useful.