[aargh]

Thanks to all who replied (so far).
Yes, the door with the slime trail. Already destroyed the mothership, so I don't expect any more little ones.

Got the Idol.
Possile spolier
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The Item I need is behind Marten's curtin, one of the three objects needed on Assension Peak, the other two are already in place. (And the Umpani still haven't arived).