How you would like to approach the mechanics is mostly up to you - maybe the well becomes a piece of jewelry? Something Nulo can keep on themselves. The moon thing is also up to you - it's safe to say the Ancient could override such a constraint, though.
Nulo's powers of course have to stay within the nerfing outlined for all characters, so nothing omnipotent, but it sounds like you've already got that in mind.
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How you would like to approach the mechanics is mostly up to you - maybe the well becomes a piece of jewelry? Something Nulo can keep on themselves. The moon thing is also up to you - it's safe to say the Ancient could override such a constraint, though.
Nulo's powers of course have to stay within the nerfing outlined for all characters, so nothing omnipotent, but it sounds like you've already got that in mind.