Well, about Demongorgon, that depends on which dialogues you chosen. If you can't remember, go talk to the knight on top of watchers keep, they "abused" your help, then return and you should be able to kill him (then he reveals and you kick it's ass). Then about the machine, there are different codes for the machine of Lum, you can get extra point on each skill (such as dexterity ect.) ( search for Lum's notes through Watchers Keep)
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http://www.angelfire.com/rpg2/mirac
I'd be Mirac, mighty mage of er... uhm.. er.. - Mirac Honorguard
Fellow Table Dancer of the Jerome's Table dancer group
Spell formulater of the IW peace-keeping force
Magical advisor of MiLady Lioness