you have three forms a regular human 5'11 a regular rat 0'3 and then a hybrid human rat 6'4

you can change in between them at will using an action you may switch 

rat unarmed=1d4 slash

human unarmed=1d6 bludgoning 

hybrid unarmed=2d6 slash

if in rat form then once per long rest you may summon a group of 20 rats with 1hp to aid in battle or distraction etc... these rats have an attack of 1dmg slashing dmg but have a attack roll of 3 on a d6 these rats go away after three turns of you change form (shown in racial trait no1)

once per long rest if in rat-human form you can emit a poisonous vapor that will take over any creature weaker than you if they fail a 15dc saving throw they will be under your control for one turn you may not command it to kill itself unless the creature made a critical failure after the one turn the creature losses half its health

once per long rest (not including the boon action itself) you may immediately take a long rest spending no time at all you must commit a real long rest to gain the ability again