[Cosmos] Item - Random Access Mindlink

Renowned researcher Alastair Toorin once said that artificial intellects would become indistinguishable from humans when they can finally concentrate on spells, and the Cosmos shall suffer for it. Figma Tech. says they can absolutely do that for you, and they come in a variety of fashionable styles.

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Random Access Mindlink
Wondrous item, technomancy, very rare (requires attunement by a spellcaster)

A minor artificial intellect loaded into this head-worn device can handle complex computations for you. While wearing this mindlink, you gain proficiency with Arcana, History, Religion, or Nature (you choose when you first attune to this), and you can make Intelligence saving throws in place of Constitution saving throws to maintain concentration on spells.

RAM Upgrade. This mindlink's onboard artificial intellect can share some of the concentration burden for you. While you are wearing this mindlink and concentrating on a spell, you can cast a second spell that requires concentration and maintain concentration on both. You make separate saving throws to maintain concentration on each spell; if you remove the mindlink, you end one of these spells of your choice. The mindlink can’t confer this benefit again until the next dawn.

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Rare Variant. The rare version of this item lacks the RAM Upgrade property.

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DESIGN COMMENTARY

This item is a play on RAM, and is styled after the classical "circlets of intellect" in sword-and-fantasy settings. As always, these technomancy items are all meant to be usable in any setting, so this can be easily reflavored as a magic wizard crown.

The circlet grants two persistent benefits: proficiency in one Intelligence skill and replacing Constitution with Intelligence for concentration. This alone is worth the rare price tag (hence the rare variant), since swapping from low +0 Constitution to +5 Intelligence is a 20%-25% increase for a typical caster character to maintain concentration. In this instance, we can assume the equivalent of War Caster, or more since it stacks with War Caster. For comparison, this item competes with Mantle of Spell Resistance, Ring of Spell Storing, Cloak of Displacement, etc.

The RAM Upgrade property allows you to concentrate on two spells at once, which by itself is sufficiently powerful to get it to the Very Rare level.

Overall, the exploit and use cases of such a item is so strong it needs to be at the Very Rare level. It should not see play until much later in the game tier, where enemies are already very dangerous.

I think there's a legendary version of this item out there somewhere that could theoretically save your consciousness into itself if you die. But that's outside the scope of this item at the moment.