Arch mage - sacrificed slots but which?

[K'yon Oblodra]

The ability removes a memorized spell, does that mean it removes the spell from the spell book entirely or just that one memorized, basically removing the spell slot.

I thought about going for Archmage but wasn't sure how this really works.

[Valefort]

Spell slot, you don't lose the knowledge of the spell.

[K'yon Oblodra]

Thx Val, say the spell altering abilities do they use a spell everytime you want to fit instance add the arcane fire effect or just once when you learn the feat?

[Valefort]

If you have arcane fire it checks the spells after rest and remove a lvl 9 one in the alphabetical order.

[K'yon Oblodra]

Okay so basically sacrifice a level 9 spell to then be able to cast all spells of the three day with arcane fire.

Edit : the spell - like ability feat, would it allow using world of the forbidden school as spell like ability?

May sound silly... Just wondering

[Valefort]

No.

[K'yon Oblodra]

Sorry to turn this into a Q & A but if I use arcane fire on a metamagiced spell it will be treated as its usual spell level wise right?

[Glowfire]

If you have an extended spell at a 3rd lvl spellslot, Arcane Fire should register that as being 3rd level.

If you plan for arcane fire, it only really gets good if you go for 10 AM.