I am homebrewing a Naga PC and using the Yuan-Ti Pureblood (Volo’s Guide to Monsters, Page 120), but I felt that Magical Resistance (below quote) was a little too strong and didn’t fit what I was going for.
Magic Resistance: You have advantage on saving throws against spells and other magical effects.
I am interested to know if this ability would be an acceptable and balanced substitute for Magical Resistance:
Serpent’s Tail: The Naga’s tail is a natural weapon. A Naga can smack an opponent with its tail to deal 1d6 + STR Bludgeoning damage. In addition, if the Naga hits, it can to attempt a Grapple against an Opponent. If the grapple succeeds, the Opponent is Grappled. While Grappled this way, the opponent is Restrained, and the Naga can use an attack on subsequent turns to Constrict the target, dealing 1d6 + STR Bludgeoning Damage to them and the target cannot breathe. This attack does not require free hands, but the Naga can only grapple one target at a time.
Also, I should note that the Naga as I have it loses most of the Innate Spellcasting from the Pureblood, except for the Poison Spray Cantrip.
Are these two abilities balanced when compared to lost Innate Spellcasting and the loss of Magical Resistance?