Base Class: Fighter
Learning from the fiercest little fighters on the planet, you have learned how to command and fight alongside the swarming mass. Swarming Blade fighter are not just using the hive they are one with it. Commanding their own swarm of crawling creatures, Swarming Blade fighters utilize the strengths of the tiny, and in return the tiny payback the Swarming Blade fighter tenfold.
Call the Swarm
Beginning at 3rd level, you can use a bonus action to call upon the swarm within and around you. A buzzing swarm of flying insects appear in a space you can see within 30 ft. of you. The Swarm lasts 1 hour, until it you dismiss it as a bonus action, or you call another swarm.
The Swarm is medium, and can occupy an occupied space. If your swarm is ever more than 60 ft. from you at the end of your turn, it is destroyed.
As a bonus action you can command the swarm to move up to 30ft in any direction.
Creatures sharing the same space of your swarm take an additional 1d6 poison damage when you hit them with an attack. When you hit a creatures sharing the swarms space, you can choose to have the target make a STR saving throw, or be pushed 10ft back in an unoccupied space you can see. You can also choose to make the target mage a DEX saving throw, or it falls prone.
You can call the swarm a number of times equal to your proficiency bonus per short or long rest.
Shrouding Swarm
7th-level Swarming Blade feature
At 7th level you gain a special connection with the hive, and can extend that bond with you allies. If you or an allies are sharing a space with the swarm, you gain an additional bonus your AC equal to your proficiency bonus. Additionally, when you or an ally take damage while sharing a space with the swarm, you can use your reaction to halve the attacks damage.
Strengthened Swarm
10th-level Swarming Blade feature
Starting at level 10, poison damage you deal ignores resistance to poison damage, and deals damage to creatures who are immune to poison damage as if the creature was resistant instead. You can also poison creatures that normally are immune to the poison condition. The swarm increases in size from medium to large.
Grasping Swarm
15th-level Swarming Blade feature
At level 15 you can command the swarm to move the grasp and hold the creatures within. As an action you can command the swarm to grapple all creatures that are large or smaller within the it. All creatures in the swarm's space must make a STR saving throw. If creatures within the it's space fail, they are grappled. Any creature that leaves the swarms space is no longer grappled. While the swarm is grappling, it's speed is reduced to 10ft. If you command the swarm to move, if it is grappling creatures, those creatures move with it. You can use your bonus action to end the grapple on your turn.
Swarming Safeguard
18th-level Swarming blade feature
Once per day, when are reduced to 0 HP or are incapacitated against your will, the swarm is called to you. The swarm moves into your space, centered on you. If you are at 0 hit point, you regain a number of HP equal to your fighter level +(modifier)