Thanks, I missed something with the skull.
I don't have the same six treasures as you: I have the golden egg while you have the ruby broach.
And I got the moss. Use something you've used before, that removes material.
You can do with paint what you wanted to do with moss.
For the huge ruby, you certainly need what's in the armoury, but it's locked.
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Thanks to your hint and my hunch, I've now got 7 treasures. I'm missing the golden egg that you've got and the last treasure that neither of us have got, unless you've got any further. Any hints on the golden egg?
I'm damn sure that those glowing grubs have something to do with the last treasure, but I think I'm suffering from a guess-the-verb problem. I have the moss and the empty trap, but can't work out what to do with them.