The Cave's Inside

They came to an agreement to go with Ian on account of they didn't have much of a choice and Trevor's condition did not give them much time to work on either.

But they had to postpone the departure time to allow Ian the proper rest so he could refill his mana reserve, having been depleted from whatever he was up to before he came back.

It took about a day and a half to get him to refill his exhausted mana reserve, a testament to how absurd of a mana reserve he is blessed with.

By the time he had completely refilled, night had met with them. They had to wait until dawn came before they started moving.

It felt like a good choice to postpone the raid to nighttime until you find out that Pharaoh ants are better adaptors to darkness than a majority of mystics were.

 Once he had recovered and dawn had arrived, they moved out in haste, carrying Trevor along with them.