| mavbor |
It can be a fun way to add something else to your adventure. As you level you can add better stats to it and make it your one major ring. By time your 20 it would equal a major artifact with awesome abilities. Just make sure you have a good way to control it since it has its own will.
It can be intellegent but still have passive abilities also.
Weirdo
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Sure, it's a neat idea. A bit of an "item familiar." Talk to your DM about the Ego, but if it's your bonded item I'd assume its alignment, opinions, and goals would match yours pretty closely and it wouldn't cause you any serious problems.
Blindsense, Telepathy, and extended sensory range would be good abilities to add. You'd have yourself an always-on invisible creature detector.