Starting at 6th level, your link to the Celestial allows you to serve as a conduit for radiant energy. You have resistance to radiant damage, and when you cast a spell that deals radiant or fire damage, you add your Charisma modifier to one radiant or fire damage roll of that spell against one of its targets.

Does this work for the Flaming Sphere spell, which does not deal the damage immediately upon casting, and does it affect every instance of damage dealt by the spell on subsequent turns?

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    \$\begingroup\$ It sounds like you're asking specifically about the 5th edition of D&D; can you confirm that for us? \$\endgroup\$ – Oblivious Sage Oct 22 '19 at 19:17
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    \$\begingroup\$ @icarus, can you tag this with the specific D&D edition? Thanks! Voting to put this on hold until it gets tagged with the edition. \$\endgroup\$ – Joshua Aslan Smith Oct 22 '19 at 19:17
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    \$\begingroup\$ Welcome to the site! Take the tour. There are multiple editions of Dungeons & Dragons, and we can't guess which game you are playing. What edition are you asking about? \$\endgroup\$ – MikeQ Oct 22 '19 at 19:18
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    \$\begingroup\$ @JoshuaAslanSmith That text is word for word from Xanathar's Guide to Everything. I don't think it's a guess to call this a dnd-5e question. (I'll put in a page number when I get to the book, this particular ability is one I just discussed with my brother a few days ago in our campaign) \$\endgroup\$ – KorvinStarmast Oct 22 '19 at 20:13
  • \$\begingroup\$ Since they are asking about the edition, and you may not be aware of what edition of the game is, what does the picture look like on the Players Handbook? Alternatively, did you read about this abilty in Xanathar's Guide to Everything, or somewhere else? \$\endgroup\$ – KorvinStarmast Oct 22 '19 at 20:47