Lizardfolk Ranger Spell Attribute for Innate Cantrip

Question

A Lizardfolk Ranger with the Ancestry Feat Bone Magic. He has +2 Wisdom and +0 Charisma modifier. He chooses Puff of Poison as his innate cantrip granted by Bone Magic. Bone Magic does not mention any specific modifier to be used as Spell DC, so the innate spells rules apply and charisma mod is used - resulting in a spell dc of 13 and 0 initial damage.

The Ranger class details say

Your warden spells are primal spells. When you first gain a warden spell, you become trained in primal spell attacks and spell DCs. Your spellcasting ability is Wisdom

I conclude that if said ranger does not have a warden spell, his innate cantrip would work as stated above. But if he would chose a feat that gives him a warden spell like Gravity Weapon at level 1 or later on his spell attack and spell DC would change.

Is this correct?

Answer 1

Innate Spells use Charisma

You're always trained in spell attack rolls and spell DCs for your innate spells, even if you aren't otherwise trained in spell attack rolls or spell DCs. If your proficiency in spell attack rolls or spell DCs is expert or better, apply that proficiency to your innate spells, too. You use your Charisma modifier as your spellcasting ability modifier for innate spells unless otherwise specified.

As you've pointed out, the innate spell rules would have the Charisma mod used because there is no otherwise specified ability. Having warden spells doesn't change that, though it may increase the innate spell DCs and spell attack rolls if the character becomes expert or better with the warden spells.