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yes, the temple is indeed located underground, although I was already underground.
I went down and killed a vampire monk, or rather, almost killed him, because the mouse flew into the coffin. Then I broke the chest, took a stick, and plunged it into the chest of the guy lying in the coffin. And there were also skeletal golems with him; apparently, there are many of them there, as well as vampires... I'll continue tomorrow, but now I'm going to sleep.
By the way, I used that altar, and it improved my sword, giving it the ability to absorb other people's powers (reducing stats, etc.). Besides that, I also leveled up and am now a level 20 wizard. The next level will be epic, I think, although I don't know, maybe I'll train a dim master... I also found magical epic gloves +30 to something and chose a specialization in destruction magic.
I hope Dicken manages to level up his red dragon apprentice to level 10 so that he grows wings.