Tomb Robber

I replayed the new version and finally made it to the dungeon. I took the yellow castle, caught the main necromancer, Zolton, with a bunch of artifacts at the top (by the way, there was no staff), went further, but there was no way through. I went down and found a yellow garrison, but here's the problem, I can't get to it. Is this another bug, or am I missing some task? The quest about "putting to rest" some Sinadim is vague: where should I look for him?

So, everything in order. The staff is hidden behind a key, and the necromancer can't take it. To find it in the dungeon, you need to look at the signs, more precisely, at the direction of one of them; it stands out. There was a message about a passage in a certain place; there is a barrier there, and you need to remove the protection for this – visit the altar (the red one); it is located in another corner of the map, near the dragon graveyard. There is a second town behind the garrison.