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It's silly but it's nagging at me: what's that feat that allows a spellcaster to sacrifice one high level spell slot for several lower level spell slots?

I don't think I have seen such a feat.
I believe the archmage has a similar power.

I'll have to check my PHB, but I think that sorcerers already have the ability to sacrifice one spell for another spell of a lower level.

But I suppose you're looking for a feat that allows someone to get multiple lower level spells?

I believe wizards can also memorize spells of a lower level.

But also check out the spell Rary's Mnemonic Enhancer.

ScS of the Fraternity wrote:
But I suppose you're looking for a feat that allows someone to get multiple lower level spells?

Yup that's it. I think it was a preview or something from the WoTC site.

I just know I've seen this before...

Where's that Rary's spell in?

PS: I look for that feat simply cause I'm reconstructing NPC sheets that I lost with my computer crash.

The Mnemoic Enhancer is in the PHB.

The feat is called Arcane Manipulation and it is in the Lost Empires of Faerun accessory for Forgotten Realms.