Ah well, it's been a week and more, and there's been next to no nibbles at the bait, so probably time to put this one out of its misery.
The game was Might & Magic VII, in which the protagonists do indeed spend most of their time chasing after goblins, ghouls, griffins and the like, before the final mission which is to enter the crashed spaceship Lincoln, fight their way past the security droids, and recover the Oscillation Overthruster -- a glowing green crystal, which can then be used to repair one of two key pieces of equipment.
In the "good" ending -- and the party will have chosen this path much earlier in the story -- the NPC they recovered the Overthruster for will use it to repair the teleport gate system, which will give them access to a transit station where they meet the android Corak ("I am a Corak, not the Corak") who welcomes them and announces that they now have access to many other worlds formerly colonised by The Ancients.
In the "bad" ending, the NPC instead repairs one of the "Heavenly Forges" (replicators) and uses it to mass-produce copies of the blasters that he and his gang brought from off-world, which they then pass out to the Necromancers they have allied with, and hordes of blaster-wielding zombies controlled by the Necromancers proceed to conquer the world.
The series continues on the presumption that MMVII ended the "good" way, when it all turns out to have been for nothing: an Ancient security system responds to an earlier invasion of the world by the enemy Kreegan by activating a planetary sterilisation sequence, and despite all the labours in MMVI and MMVII, MMVIII ends with the world blowing up after all, although the population is able to escape to other worlds.
Over to... well, anyone, really.
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