This fansite has descriptions and such of all the abilities, ships, research, etc Have fun!

The Marza Dreadnought's Missile Barrage is my current favorite ability.

I've been playing vasari mostly so heres what I know about the fourth skills:

kortul devastator: volstile nanites: sends some bot to an enemy ship and when the enemy ship explodes the volatile nanites will make the explosion hurt nearby ships

skirantra carrier: replicate forces: creates 3 clones of any frigate or cruiser(time limited)

jarrasul evacuator: drain planet: deals 45 damage per second to a planet while also gaining resources

antorak marauder: stabilize phase space: creates a phase stabilizer node which allows troop to phase between the marauder and any other phase stabilizer in the solar system

vulkoras desolator: disintegration: steals some hull points from an enemy ship and uses it to heal the desolators hull points

At least this is what i know I havent played a TEC and Advent much. I found this out by playing a game with all these capital ships at once, so I started experimenting.