D&D 5E Caster items in Tasha's, a very good start.

[Quartz]

Robes of the Archmage, Grimoire +3, Wand of the Warmage +3

Do they stack?

 

[Flamestrike]

Do they stack?

Yep.

Uses up all three attunement slots though.

 

[Quartz]

Yep.

Uses up all three attunement slots though.

Let me rephrase that: do you, as a DM, have to let them stack?

 

[Paul Farquhar]

Let me rephrase that: do you, as a DM, have to let them stack?

As a DM, you can rule any way you like.

But there is nothing in the rules as written to prevent them stacking.

 

[John R Davis]

Plus. They have to find them / be in the campaign!

 

[Azuresun]

Robes of the Archmage, Grimoire +3, Wand of the Warmage +3

+8 to spell attacks, +5 to save DCs on your Wizard spells.

So glad I use the 'Natural 20 passes a save, and a nat 1 fails it' houserule.

Well, if you choose as the DM to let your players have all of those items, then I assume you want to have them throwing around unbeatable spells?

 

[Sir Brennen]

If it's just items granting +X, I'd assume the rarity corresponds to the rarity of a magic weapon +X in the DMG (i.e., a +1 Amulet of the Devout would be Uncommon, +2 Rare, +3 Very Rare)

 

[SkidAce]

I think I will let players have a separate pool of attunement slots for tattoos. (same amount).
Will probably make them permanent when applied however. No turning back into a needle.

I like magic tattoos. "Might" even let CON mod add to number of tattoos.

Will evaluate....

 

[ProphetZarquon]

So... as written, as an action, the Alchemical Compendium can turn pretty much any valuable non-magical item such as a diamond (which has a list cost of 5000gp), into a Rare magic item, 1-to-3 times per day.

Unless a GM homebrews the worth of concerned items, or homebrews a prohibition within this item's usage, it can produce very powerful stuff, such as a +2 Arcane Grimoire, a +2 Wand Of The War Mage, a Belt Of Hill Giant Strength, or another Alchemical Compendium, for as long as you keep feeding it valuable non-magical items.

At best, there's at least the reasonable argument that they need to see or be familiar with a type of item, to have the AlcCom make it; but the item doesn't explicitly say that, it has to be interpreted as in some way being obvious or implied. Once the character knows about a type of item though...

 

[Benjamin Olson]

I think the Feywild shard, which lets Wild Magic Sorcerers voluntarily trigger a Wild Magic Surge anytime they cast a spell with metamagic, basically fixes a subclass that never quite worked. It should be handed to every Wild Magic Sorcerer at character creation.