So I started playing a Homebrew recently and the DM has a set of Ranged-spells attacks that require a bow (I already have one). One of the spells is as stated:

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> For the duration of this spell you create two wispy arrows notched into your bow that reappear each time you attack. Whenever you attack a creature, roll an additional ranged spell attack roll and on a hit you deal an additional 2d10 force damage.
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My only question is: Do I use my Wisdom Mod or Dex mod, since I'm a 12th level Drakewarden Ranger?