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You aren't stuck, though I could see how the stone would mislead you that way. I may consider putting that somewhere else. 

There is another ability you have now with the level 3 ring, not a third block. The hint is when you pick up the ring: "the void cannot consume them" (don't remember the exact wording!) 

Okay, that makes sense. I think I must've blown by the comment on the ring too fast, because I don't remember that wording. Player error.

I think it would be helpful to put the stone somewhere else.

Okay getting the hint from the ring again got me unstuck pretty quickly.