Witchwarper NPC creation special rules confusion

[Santobon]

I’m a little bit confused with the Witchwarper’s NPC special rules on AA4 Pg. 151.

Someone said wrote:

"Because an NPC spellcaster doesn’t receive the same number of spell slots as a PC spellcaster at higher CRs, a witchwarper NPC only expends spell slots to power their infinite worlds ability for spell levels at which they receive specific numbers of spell slots per day. For spell levels they can cast at will or don’t have listed, the NPC effectively has three spell slots of each level that can only be used to power their infinite worlds ability. For example, a CR 10 witchwarper NPC effectively has three 2nd-level spell slots and three 1st-level spell slots for their infinite worlds ability."

(AA4 Pg. 151)

So does that mean, the Witchwarper doesn't expend spell slots when casting spells?

With their example, I'm not sure how they came to the conclusion a CR 10 Witchwarper NPC has 3 x 2nd Lvl spells lots and 3 x 1st lvl spell slots (For their infinite worlds ability).

Cause it goes counter against the rules for Spells for NPCS in AA1 Pg. 143 and rules for the Witchwarper in CharOps Pg. 60.

[Xenocrat]

So AA4 pg 151 has the following spells for a CR 10 spellcaster:

4th level spells - 3/day
3rd level spells - 6/day
2nd level spells - at will

2nd level spell are castable at will, 1st level spells are not listed. So they effectively have three spell slots of those levels ONLY for infinite worlds.

For 4th and 3rd level Infinite Worlds effects, they can spend them all of their 3 or 6 spells per day on Infinite Worlds instead of spells.

I can infer the reason for this. They want you to be able to use 2nd level Infinite Worlds effects, but they don't want you to be able to do it infinitely the way they can with other 2nd level spells. (Those at will spells are an accounting convenience, not meant to imply they literally can cast the same spell 500 times in day.) Since 1st level Infinite Worlds spells have different effects, they also gave you some of those, notwithstanding they don't bother making it standard to actually give you 1st level spells (again, this is for convenience for NPCs mean to be faced in combat - it's not that they literally have no 1st level spells known, it's that they're unlikely to find such things worthwhile in combat against relevant PCs, so as a basic rule they don't bother with them).

[Santobon]

Ahh, I see what you mean.

So Witchwarpers: (Assuming it's not at Will): Do expend Spell slots normally for spells.

And there is a guaranteed pool of 3 spell slots per cast at will or don’t have listed spell level thing.

The verbiage threw me for a loop.

[Metaphysician]

Honestly, the Infinite Worlds abilities are generally weak enough that I'm halfway inclined to make them unlimited usage, even for PCs. They are cool, but not exactly as game-changing as a typical equivalent-level spell.