Conduit

At 5th druid level, you can spend a rest dice to augment or modify a spell being cast by another creature. The spell must target a creature or area within 30 feet of you, or the caster must be within 30 feet. Doing so is a reaction. You know a number of such modifications equal to your wisdom bonus + 1, and you learn a new modification at each conduit level. You can apply up to 2 modifications to a spell, and you cannot apply the same modification more than once.

Modifications:

• The damage dice of the spell are increased by 1 size category.

• The spell attack used to cast a spell must be re-rolled. 

• The spells area is increased by 15 feet. 

• A creature and all creatures within 5 feet of it that are targeted by the spell gain advantage on any associated save against the spell.

• If the spell grants temporary health, it is increased by 1d6 for all targets.

• Any necrotic damage dealt by the spell is instead radiant damage, and is increased by 2

• Become the target of a single target spell.

• The spells duration is increased by 1 hour.

• Any healing granted by the spell becomes 1d10 lightning damage.

• The save DC of the spell is increased by 2.

• If you are a target of the spell, heal 1 fatigue and 1d4 health.

• If you are a target of the spell, gain 1d6 arcane health.

• If the spell has a health or death save cost, you can redirect it to another creature within 30 feet.

At 6th druid level, gain one of the following abilities:

• Lightning soul - Gain resistance to lightning damage, and increase any lightning damage you deal or that is dealt by spells you modify by 1d6.

• Enigmatic sight - Gain +1 to all saves, and gain a +1 bonus to perception, insight, and investigation checks.

• Heart of vitality - Gain a +2 bonus to charisma, +1d4 bonus to performance and deception checks, and increase your maximum health by 7.

• Chaotic spirit - You can use mysticism or bestow insight once per long rest as a free action with no rest dice cost. 

• Weaver of fate - You can apply 3 modifications instead of 2 when using channel magic.

• Stalwart mind - You gain a +1 bonus to wisdom, your rest dice maximum is increased by 1, and you gain an extra feat.

• Arcane insight - You can channel magic when casting your own spells by spending a bonus action and your reaction immediately after casting.

At 7th druid level, choose 3 complex modifications to learn from the list below. Choose another at 8th druid level. You can choose to apply a complex modification instead of 2 regular ones.

• If the spell conjures a creature, it instead conjures 1 more.

• If the spell conjures multiple creatures, it instead conjures 1 less and grants all summoned creatures a +1 to all attributes, saves, and skill checks.

• The spell is unaffected, but you replace a spell known with the spell at the appropriate level.

• You can redirect a failed spell attacks as you wish with a spell attack of your own.

• For a touch spell, copy it and cast it at your own range.

• If the spell heals, it heals an additional 1d8 health.

• The trajectory of a ray attack is redirected as you wish, up to 45 degrees.

• If the spell enchants or conjures a weapon, the weapon deals 1d4 extra damage of your choice: fire, cold, or lightning damage.

At 8th druid level, all healing from essence shift is increased by 2.

When a essence shift benefits from a 3rd level spell or higher, or from at least 3 rest dice, roll a d10. On a natural 10, you regain 1 rest dice.