As a noob I was quite successful with a full summoner build up to now. Focus on escape and let the golem do the work. Amplify damage/remove traps as support, Dig/Create walls, Teleport and other escape spells. Enough drinks to overcome confusion/fear.
In the beginning 25 or 50 additional mana seems to be crucial. When approaching ugly rooms (detect monsters), buff the golem with some drinks and reserve enough mana to get another one just in case. I will see how far I get.
Level 18 at 600ft. The Dread lord was spooky, and you Must take care, That no monster sneaks by the golem as those poison demons or maw beasts can dish out immense damage in short time. But a teleport and created surrounding walls helped. So I could fight all those ghosts first and the other stuff later.
Still working for me. I sit at depth 750 with level 20 and 40 mana recovery. Golem kills most Threats. Those ghosts (especially Dread Lords) are Most dangerous for me as I cannot shut the door by create wall. I am barely able to kill anything on my own.
I‘m dead. The first lich got me, I suppose. Lost 100 Mana and was stunned. So I Chose to wait one turn for the stun to run out. No enemy near. Somebody
got enough damage in from afar to clear the Mana shield for the first time since dungeon level 1, and That w
was followed by 1600 damage – with around 600 health too much to live. Permadeath. Should have put up Wall of stone. Sigh. Next try