Gem Channeler

Gem Channelers harness arcane lattices within gemstones, embedding them with magical matrices that amplify allies, distort energy, and refract spells.

You use gemstones as modular magical cores — swapping them during rests to adapt your role (support, offense, defense, control).

Level 3: Gem Lattice

3rd-level Gem Channeler feature

You create magical gemstone cores that project arcane enhancements.

At the end of a long rest, you create three Gem Cores of your choice from the Gem Core list below. You can replace your chosen cores whenever you finish a long rest.

As a bonus action, you can activate one of your prepared Gem Cores, targeting yourself or a creature you can see within 30 feet. The core remains active for 1 minute, or until you activate a different core.

You can activate this feature a number of times equal to your Intelligence modifier (minimum of once), and you regain all expended uses when you finish a long rest.

Only one Gem Core can be active at a time at 3rd level.

Level 3: Ruby Core — Power Surge

• The target gains resistance to fire damage.

• Once per turn when the target deals weapon or spell damage, it deals additional fire damage equal to your Intelligence modifier (minimum of 1).

At 9th level, the extra damage becomes 1d6 + your Intelligence modifier.
At 15th level, the extra damage becomes 1d8 + your Intelligence modifier.

Level 3: Sapphire Core — Aegis Field

• The target gains a +1 bonus to AC.

• The target gains resistance to cold damage.

• When the target takes damage, you can use your reaction to reduce that damage by 1d8 + your Intelligence modifier.

At 9th level, the reduction becomes 2d8 + your Intelligence modifier.
At 15th level, the reduction becomes 3d8 + your Intelligence modifier.

Emerald Core — Vital Surge

• The target gains temporary hit points equal to your artificer level.

• At the start of each of the target’s turns, it regains hit points equal to your Intelligence modifier (minimum of 1).

At 9th level, the healing equals twice your Intelligence modifier.
At 15th level, the healing equals three times your Intelligence modifier

Level 3: Amethyst Core — Mind Prism

• The target has advantage on Constitution saving throws made to maintain concentration.

• The target gains resistance to psychic damage.

• Once per turn when the target deals spell damage, it can deal an extra 1d4 psychic damage to one creature affected by the spell.

Level 3: Topaz Core — Kinetic Refraction

• The target’s walking speed increases by 10 feet.

• The target ignores difficult terrain.

• Once per turn when the target hits a creature with an attack, it deals an extra 1d4 lightning damage.

Refracted Casting

5th-level Gem Channeler feature

When you cast an artificer spell of 1st level or higher while a Gem Core is active, you can refract the spell’s energy.

Choose one of the following effects:

• Add your Intelligence modifier to one damage or healing roll of the spell.

• If the spell targets only one creature, you can cause the spell to arc to a second creature within 15 feet of the first target. The second creature experiences the spell’s effects at half potency (half damage or half healing, rounded down).

You can use this feature a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.

Level 9: Resonant Matrix

9th-level Gem Channeler feature

Your gemstone lattice stabilizes into a harmonic network.

• You can have two Gem Cores active at the same time.

• You can switch one active core to another prepared core once per turn without using an action.

• When a creature benefiting from one of your Gem Cores rolls a natural 20 on an attack roll, ability check, or saving throw, it regains hit points equal to your artificer level + your Intelligence modifier.

Level 15: Prismatic Overload

15th-level Gem Channeler feature

As an action, you can shatter your active Gem Cores in a burst of refracted magic.

Each creature of your choice within 30 feet gains temporary hit points equal to 2d8 + your Intelligence modifier.

Additionally, each of those creatures can immediately use its reaction to deal 3d8 force damage to one creature it can see within 30 feet.

Once you use this feature, you cannot activate Gem Lattice again until you finish a short or long rest.

Level 20: 💎 Level 20 Synergy: Gem Channeler + Soul of Artifice

At 20th level, all artificers gain:

Soul of Artifice

• +1 bonus to all saving throws per attuned magic item (max 6).

• When reduced to 0 HP, you can end one infusion to drop to 1 HP instead.