Shapechanger. Akku can use his action to polymorph into a beast form that resembles a lizard (speed 20 ft.), a raven (20 ft., fly 60 ft.), or a spider (20 ft., climb 20 ft.), or back into his true form. His statistics are the same in each form, except for the speed changes noted. Any equipment he is wearing or carrying isn't transformed. He reverts to its true form if he dies.
Stygian Sight. Magical darkness doesn't impede the Akku's darkvision.
Magic Resistance. Akku has advantage on saving throws against spells and other magical effects.
Eldritch Empowerment. Akku's attacks are considered magical for the purpose of overcoming immunity and resistance to nonmagical attacks. Akku is able to Attack if Feity is perceiving through his senses. If Akku forces a creature to make a saving throw it uses Feity's spell DC.
Be My Eyes. Feity can communicate telepathically with Akku and speak through him with Feity's voice without distance penalties as long as they are on the same plane of existence. Feity can place his consciousness in Akku.
Companion. Akku can take any action that it is capable of other than the Attack action. This includes the Cast A Spell, Dash, Disengage, Dodge, Help, Hide, Ready, Search, and Use an Object. With Pact of the Chain Akku is able to Attack if Feity is perceiving through his senses.
Chain Mastery. Feity uses Bonus Action so he can command Akku to take the Attack action.
Bzzzt !!! (Bite in Beast Form). Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 1d4 + 3 piercing damage, and the target must make 15 Constitution saving throw, taking 3d6 lightning damage on a failed save, or half as much damage on a successful one.
Invisibility. The Akku magically turns invisible until it attacks or until its concentration ends (as if concentrating on a spell). Any equipment the drake wears or carries is invisible with it.
Pact of the Chain. When Feity takes the Attack action, he can forgo one of his own attacks to allow Akku to make one attack with his reaction.
Can Touch This! When Feity casts a spell with a range of touch, Akku can deliver the spell as if it had cast the spell. Akku must be within 100 feet of Feity, and it must use its reaction to deliver the spell when Feity is casting it. If the spell requires an attack roll, Feity's attack modifier for the roll is being used.
It hurts. When Akku takes damage, Feity can use reaction to grant Akku resistance against that damage.
Description
“I am the guardian of drown souls! I am the powerful, the wonderful, the indestructible AKKU!”
In Stygian form Akku is infused with the aspect of the Styx. The name of this shape comes from the place, wher the river Styx presumably holds its headwaters. Akku himself considers this form as his true shape.
This is the form Feity refers to as "neutral". Akku looks almost like his default variant, but is much more spiky and there is always a keen intellect lurking in his vivid eyes. He is also a bit smaller than in default form, but he can comprehend bipedal posture, if he wants to.
When becomes disturbed, he is able to burst lightning from himself via hit. He can use this energy to harm someone or electrocute them.
Akku can speak in this form, and he overuses this trait rather often. He listens to almost all Feity's command, as he realizes that he is bound to the Styx, thus without the half-elf, the mighty river will become his prison. This fact does not stop him from commenting on his master's actions though.
In contrast to the Feity, Akku is in most situations more comical, overconfident, and impulsive. He strives to be one of the greatest dragons and selfishly comes to Feity's aid to turn half-elf into a Deep Sage. That behaviour is in no doubt caused by his devil' s part of the aspect. With that said, he is more likely to be mocking and manipulative than outrightly cruel or murderous to 'lesser' creatures.
Although Feity would disagree, Akku seems to be very keen and reliable creature, if able to talk and act according to his own will. Even though he was complaining about the course of action, he also tends to look for solution.when party encounters a problem.