Your current objective is to "get out of the tomb(dungeon) alive". I can spoil:
[ +- ] Spoiler
the only way to get out of the tomb will be passing by the artefact. You will have the choice not to destroy it, but I can't believe players would choose that. Not after you see the narrative.
It could be logical that the exit from the thomb is at the lowest level, so feel free rush down. I see no problem with that.
Do you stay in this level, go 25 down, go 50 down and open the doors. go 50 down and follow the south corridor, do anything else - I'm good with anything you do, I'm just waiting for your decision, dear players.