DM Academy

How would you react if a group of ants managed to in perfect English ask you to pretty please just take walk nominally further to go around their ant hill instead of stepping on it, and they they would feed you if you did?

You've made a boss with no actual motive to destroy the town other than that the monster is lazy and can't be bothered to walk about three extra miles on it's trek.

I personally would argue that this is a no roles required sort of event. Probably have them roll to make the food, they seem to already be proficient with Cook's tools so it's just whatever the highest attribute that they can justify + proficiency is. Then just have them talk.

You don't need to make them roll diplomacy or anything if you don't want to or if it would bog down the scene. Let them beg for the life of their village, try to make their case to something that could kill them without a second thought that they are worth allowing to exist in this world. If their arguments are bad or drive the monster to anger the fight starts now. If their arguments are good and would sway an apathetic beast and have the monster walk what is to it a trivial amount of extra distance.

Some important things to think about are why does this monster refuse to move its path. Did arrogant and believes all life weaker than it is worthless intrinsically. Is it simply lazy and doesn't care about anyone but itself. Is it actively spiteful and hates that other things exist on principle. Does it itself feel trapped governed by forces out of its control. Etc.