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Normally you can't use Spell like abilities if your charisma is below 10+level of spell replicated.No, that's not a thing. Charisma is only used to determine DCs for SLAs.
Feeblemind does stop them from working, but only because SLAs count as spells.
it's actually a thing, although not only cha sometimes its int or wis. a lot of the alt race options that give sla demand the character have a minimum of cha\int\wis. look at the gnome and elf alt racial abilities , for example:
- Pyromaniac (gnome alt race ability) :
"... Gnomes with Charisma scores of 11 or higher also gain the following spell-like abilities: 1/day—dancing lights, flare, prestidigitation, produce flame. ...."
- Fey Magic (gnome alt race ability):
"...if the gnome has a Charisma score of 11 or higher, she also gains the following spell-like abilities: 1/ day—charm person, dancing lights, entangle, and prestidigitation..."
- Lightbringer (elf alt race ability, int based this case):
" ...Elves with Intelligence scores of 10 or higher may use light at will as a spell-like ability. .."
- Envoy (elf alt race ability):
"...Elves with this racial trait and an Intelligence score of 11 or higher gain the following spell-like abilities once per day: comprehend languages, detect magic, detect poison, and read magic...."
and more.