i’ll quickly paraphrase one i used to go through with my group:

small group of adventurers are travelling through a small village. town is half destroyed, lots of sick people etc. basically the village has gone to ****.

bla bla bla after rp stuff your group find out there’s a wizard over yonder in his tower ransacking the town and the general country side.

your group decides to go vanquish said dude, be it to help the villagers, take the wizards plunder, both, or then kill villagers as well.

go up to tower, have some nice random encounters with some of the wizards goons.

get to the tower, as you see the wizard on top blasting spells, huge dragon appears from behind the hill. (ideally you want the tower on a hill, few forests around) nice surprise for you adventurers and a dragon fight is always fun.

before the dragon dies the wizard jumps down from his tower bringing said adventurers into another dimensional plane. bla bla bla epic fight do what you want here, i have dimensional rifts exploding and stuff but it’s your choice.

they defeat the wizard, escape the imploding dimensional plane and then do what they want with the wizards stuff and the village.