Iron Heart's page

A friend brought it to my attention that the NPC guidelines in Lost Omens Character Guide include mention of new kinds of skill-having for non-player characters, noting that templates may list skills to add to the statblock, either as primary skills (if you have reason to believe the creature would be good at it) or secondary skills (if you don't). Dark Archive has something similar.

But what does it mean to be a primary skill or a secondary skill? Is there a canonical answer as to what they correspond to in the Designing Creatures section of the GameMastery Guide, where the terminology is low/moderate/high/extreme? It's frustrating seeing a third angle of describing how good a creature is at something, after TEML/LMHE, and to not even see what the writers mean by it.

Beyond the minimum Intelligence score and class level requirements, how often can an Alchemist mix a non-infusion extract using the same slot? Assuming an instantaneous-effect extract is mixed at midnight in a 24-hour day, when can it be prepared again if it is consumed at 1 PM? 11 PM? (A consideration to include is that arcane and divine spells cast in the last 8 hours count against ready slots.)

Can you ever reclaim a slot used to mix an infusion?

There's a bit of an argument at my table about a multiclass character who's been preparing his wizard spells as if they were magus spells, so I want to know, is it possible to prepare shield (learned at character creation in the wizard's spellbook) as if it were a magus spell?