Lambda

Skill #3: Nova Barrier

Lambda has an ability to create what is essentially a shadowy shield, but it has some really interesting limitations. It looks and sounds like this when he engages it: the moment when he leans back and there's a high-pitched gaspy noise. It should be noted that it's dispelled within seconds in that video, but if you look closely you can briefly see a shadowy black and red mist that settles over him. That's the Nova Barrier.

So let's recap:
• There's a reddish light when he engages it, along with a high-pitched whiny gasp noise.
• It looks like a vaguely misty dullness that settles over the skin and reddens the eyes.
• It greatly lessens the damage from attacks, but does not entirely negate it.
• It can be broken with nova elemental artes, hence the name. Here in Aather, you might call them instead light or lightning elemental. However, they have to connect with the Nova Barrier to break it, so sunlight shining down isn't going to do anything.

He can pass this ability along, but only to his offspring or people he's possessing. And he can't do that yet, so.

Skill #1: Telepathy

Lambda is a symbiotic headmonster whose primary form of communication is telepathy! He primarily uses it to communicate with his host, though that's not going to happen until he gets back the skill to actually possess people. We do, however, see him use it multiple times with people he's not possessing, so here are some basic facts:

• This is not "I ransack your mind and read all your innermost thoughts" telepathy. Unless you're specifically thinking at him, he can't hear you at all. (He may or may not hear you if you're thinking directly at him-- for ease of play, I'm going to say "yes, he can," because iirc we never get a clear answer in canon.)

• It is touch-based. He can't speak in your mind or hear your thoughts if there is not physical connection between the body he's currently inhabiting (which, right now, is a small humanoid body) and the person he's talking to.

• The exception is if he's in his true form. If he's in his true form, there is more of a range, because his true form is not physical the same way a body is, and thus his consciousness is capable of extending without touching.

• Last, but not least, you might expect someone who looks like this to have a high, androgynous voice. Which he does! …if he's speaking aloud. But his voice, the real one, the one you'll hear in your head, is deep and very old.

This has Tales of Graces F spoilers, but is a good demonstration of how Lambda's telepathy works and how he sounds.