Part of Destiny: Nimble
Level 3
Attuned - Psychic.
Gain the Strand Spell School. Shadow Blast and Shadow Minions may deal Strand damage.
Threadling Swarm.
Action: Summon an immobile Threadling Swarm within Reach 6 (max INT Swarms at a time). At the end of your turn each Swarm spawns a Threadling: roll 1d6 for each Swarm. Whenever you or your minions attack, expend these dice, divvying them up as damage amongst any enemies within Reach 6 of a hive. If any die rolls max, you may also have 1 minion Sever its target per max.
Level 7
Rampant Swarm.
Action: Your Swarms can Interpose for you or allies. Whenever a Swarm dies, it spawns a threadling twice and Severs its attacker if in an adjacent spot. Whenever you command your minions, your Swarms can also move
Level 11
Instant Infestation.
2 Actions: Use Pilfered Power to spawn INT Swarms. You can expend Threadling dice whenever an enemy comes within Reach 6 of a Hive to damage them.
Level 15
Webs of Control.
Enemies within Reach 2 of your Swarms become Severed. Your Threadlings are immune to non-critical Ranged attacks and roll with advantage against Severed enemies.