hey! 4 things
1 the operations on magic/custom attributes don't seem to be working with modifiers
(i checked another person's issue)
the vinella ones work but custom magic ones dont seem to work

2 is there a way to make wands or custom items (saved as wands because as far as i know that's the only way) usable as spell costs?
(i have little paper sigils)

3
using modifiers added to mages is there a way to specify what class a spell is added to? (if you wanted some undeactivateable passives and then some bonus spell when you use the main magical casting class

4 is there any reliable way to detect if a player is exposed to the sun? i could probably phenagle some sort of workaround but it would also be cool if there was an allready known way (something like a passive spell that strenthens a caster in the sun)

Sorry again for dropping the ball here!

Um.. I think if I am understanding you would just like a way to hide certain spells (mostly passives) from the wand inventory?

1. the operations on magic/custom attributes don't seem to be working with modifiers

By "operation" do you mean how you can specify that attributes are additive or multilplicative, that sort of thing?

If so then yes that's a vanilla feature and not supported by magic- magic modifiers and classes can only stack (additive) or not (increase value if higher).

2. You can /mitem save <name> any item, wand included, then use it as a cost. That may work with a wand item directly too, not sure I've ever tried that though.

To use items in costs you just put the item name as the cost, like

costs:
  emerald_sword: 1

3. I'm not sure I understand that one, the spells don't really get added to any particular class, they're just active (I think this only works with passives IIRC)

4. I think a combination of light level and whether there's a block above you .. you could get the latter with the new target_highest option of the Cover action, but I wonder if I should also add an attribute for highest_block_y or something.

wow thanks for the quick response!
thanks for the support!
reguarding 3.
lets say i have 2 types of modier spells (for the sake of simplicity just a and b types

A spells are soposed to be used and acsessed ( a bonus attack or something)
B spells are just things saved as spells but not soposed to be interactable (say something using a trigger or a passive)

i need to specify the A spells to be used by my wand's class (appearing in the wand's inventory)
B spells can be kept as is (not showing up in the wand's inventory because they player isnt really soposed to be able to mess with them)
I think that adding the A spells to my wand class could work but i dont know how to, if possible set the modifier to group spells by class would fix my issue but i hope this helps clarify