My Undying Light Warlock needs a familiar for his Pact of the Chain, any ideas for small enough celestial creatures?

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I was thinking of tweaking an imp for a more celestial feel but if there's a positive plane creature that already exists, I'd prefer that 😊

— Craig Hallam (@craighallam84) July 30, 2017

— Craig Hallam (@craighallam84) July 30, 2017

You guys are the experts. Any tips? (if you have a second, thank you so much)Lantern archon?

— Mike Mearls (@mikemearls) July 31, 2017