Forgot the name and book with the Practiced Spellcaster for spell-like abilties

[Dunsparce]

I remember that there is an official 3.5 book(I think it might've been either a module or setting-specific book) that had a feat that was identical to Practiced Spellcaster, but was specifically for Spell-like abilities.

For the life of me I can't remember both the name of the feat and the book it was from.

[ShurikVch]

Practiced Magic (The Shackled City Adventure Path)

[Bphill561]

Practiced Magic (The Shackled City Adventure Path)

That is useful, I only knew the one in Dungeon Magazine #116.

If you are not talking about class based Spell-like abilities, you can also take Supernatural Transformation from Savage species. Not only does it change your SLA into a supernatural ability, it sets your ability to the original caster level or your HD. I think the FAQ said it was a no go for a warlock, but that does not seem to match the rules.

[Troacctid]

That is useful, I only knew the one in Dungeon Magazine #116.
It was printed as part of the Shackled City adventure path in Dungeon Magazine and later reprinted when the AP got its own hardcover release.