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So I know it's listed as their Key Ability, but I'm having trouble figuring out what separates a human cleric with 18 wisdom and a goblin cleric with 10. Do you still need a certain ability score to cast spells? Is it just for spell DCs and spell rolls? I know it governs the Religion skill, but that seems less with things like Assurance.
If a cleric is planning only to buff and heal, how high does their Wisdom need to be?
Only buff and heal? Then it doesn't matter beyond will saves, perception and so on.
If you're planning on forcing saves, or if your domains use wisdom (some do), you'll want it. If not, then it doesn't really matter. That's true for most Spellcasters, really.