In D&D 5e when a character casts a spell from a staff (e.g. staff of a magi), what is the class of that spell? It is important for items like "+1 to DC for this class spells that you cast" from Tasha's.
- I am a lvl 20 Artificer.
- I am attuned to and holding a Staff of Power, and casting Hold Monster from it.
- I am also attuned and holding in my other hand (let's say DM would allow my hand to hold all of them, this is just for illustration) all of the following:
- +3 All purpose tool (bonus to artificer spells I cast).
- +2 Arcane Grimoire (bonus to wizard spells I cast).
- +1 Bloodwell Vial (bonus to sorcerer spells I cast).
What bonus to DC will I get from these items when casting this Hold Monster?