u/Ptalking_Ptarmigan

The party's barbarian was taken by the roc on the Isle of Solstice (because the player is away IRL). Now, the party wants to rescue him.

I'm thinking of using a modified Cave of the Berserkers as the rescue mission. Changes would be:

• Cave is on the island and roc nest is on top of the mountain where the cave is. (Alternatively, the cave is another floor of the castle?)
• Barbarian has been taken from the nest into the cave to convert him into a being like Sephek Kaltro, so party can't just fly to the nest.
• Chardalyn berserkers replaced with two coldlight walkers and a few undead with Sephek Kaltro's stats. Maybe add a puzzle trap.

Does this make sense and seem fair? Do you have any ideas to make it better? Party is 9th level, but low on resources since they can't rest as normal on the island.