Imam running a modified version of the Shackled City epic campaign where the heroes are protecting a small village from being attacked by hordes of creatures led by a Demon Glabrezu. The demon is bound to the material plane until it can destroy the village. The heroes were given a manacle that has Dimension Anchor cast on it with the idea that they have place it on one of his small arms to prevent his teleporting away. Question - how would you officiate this action? My thought is it would be a CMB vs CMD roll but since they are only slapping on an oversized bracelet I would give them a +4 or so circumstance bonus since there is enough danger getting close to the creature as it is. The heroes are around level 13 and their CMBs are in the 10-15 range or so. Demon CMD is 34.
Thoughts or critiques of my modification of the mechanics?
Thanks for taking the time to read this and offering your wisdom.
Hopefully their CMBs are a lot higher after buffs. Like true strike.
Are they provoking an AoO from the demon to try to do this? If the demon hits on the AoO, the damage would count against the CMB check.
They'll probably be fine if they play it smart and plan it out. I dunno how good your players are about that.
If they manage to sneak up on the demon (highly difficult, especially since invisibility doesn't work), they could prevent AoO's and go against flat-footed CMD.