PhoenixUltima: Er, that's only true in the beginning of the game. If you come back to the mystech mines later on the doorloor is off in a side area as an optional boss.
And no, you don't have to fight him to get the Laserblade. Bring Stilletto along with you and look high up on the walls - there should be a switch you can hit with throw loonie (might need to be master level). That opens up a panel at the very start of the mines with the laserblade.
If you want a go at the doorlord, he's vulnerable to stun attacks, so the usual strategy is to bring Paco and Democratus and use their stunning bouges whenever his stun wears off. If your timing is right the battle is relatively easy, if tiresomely long.
Did you beat him? I just finished the game without being capable of defeating the doorlord (I thought it was not possible).
I would like to know if someone did actually defeat him. Every time I managed to give him a good fight he ended up sending a 10k hit points attack to all my characters (killing them, of course).