Endur
First Post
I think you could adjust Out of the Abyss for level 15-20 (instead of levels 1-15). The problem however is that extremely high level characters will have abilities (Gate, Time Stop, Wish, etc.), that the module authors never foresaw in writing the module.
My actual recommendation is to temporarily retire the level 15 party and start a new 1st level party for Out of the Abyss. The high level party could be mentors for the low level party, and when the low level party approaches a similar level, you could combine both parties to let the players play either character they prefer for the final encounters in Out of the Abyss.
My actual recommendation is to temporarily retire the level 15 party and start a new 1st level party for Out of the Abyss. The high level party could be mentors for the low level party, and when the low level party approaches a similar level, you could combine both parties to let the players play either character they prefer for the final encounters in Out of the Abyss.