If I have a Scrollmaster/Cyphermage/or other class that boosts lvl when casting items, but in this example: a scrollmaster Level 10, and craft a level 1 scroll with heighten spell metamagic attached as a 1st level spell scroll, when I cast it later from the scroll as a 15th level caster, or whatever I am, is it casting heightened at my level?
You can cast spells as if they were a higher level.
Benefit: A heightened spell has a higher spell level than normal (up to a maximum of 9th level). Unlike other metamagic feats, Heighten Spell actually increases the effective level of the spell that it modifies. All effects dependent on spell level (such as saving throw DCs and ability to penetrate a lesser globe of invulnerability) are calculated according to the heightened level.
Level Increase: The heightened spell is as difficult to prepare and cast as a spell of its effective level.
At 10th level, the scrollmaster can cast a Wizard spell from a scroll and use his own Intelligence score and relevant feats to set the DC for the spell, and can use his own caster level if it is higher than that of the scroll (similar to a caster using a staff ). The scrollmaster must have already deciphered the writing on the scroll to use this ability.
This ability replaces the 10th-level Wizard bonus feat.
I think you have the wrong forum. As far as I know there is no such thing in Pathfinder 1E. There is a scroll savant in the computer game, but nothing in Pathfinder that I know of.
Yes, it was a mistype. I meant Scrollmaster's final ability.
Heightened spell raises the spell level to what is chosen when the spell is prepared or inscribed, up to the maximum spell level you can cast. The spell is then treated as that spell level for all purposes. Preparing or inscribing a heightened spell at its actual level does nothing. Improved Scroll Casting raises the caster level, but does not affect the spell level.
So, in your case the spell will still be a 1st level spell, but its caster level will be whatever your caster level is. If you inscribed the scroll as a 4th level spell with a caster level of 7 (The minimum you can for a 4th level spells). And then cast it from the scroll it would be a 4th level spell using your current caster level.