Under Eden
Track "Six Feet Under Eden"
The beginning makes it clear that the drums are leading the band. Its nice to hear them simultaneously used for beat structure and also as their own instrument. The texture of the sound from them is reminiscent of echoes in a dimly lit cave, and it seems he doesn't want to let a millisecond go by without some interjection of a trill. The vocals are mildly brooding. The overall presence of the band has an under produced, grimy feel which I liked, since that kind of rawness brings the feeling of connection without having to adjust to any pretentiousness.
MercyKill
The vocals on the song "Jihad" have some momentum to their presence, and nice change ups. The mood swings on the track "Two Dimensions" though were relevant to the song's meaning, and the guitar solo that tears out of the mid-breakdown in the song was like hydrochloric acid being poured on your face. Definitely my favorite track by them. The vocals have a thick industrial timbre, with Phil Anselmo undertones. A lot of their tracks actually have some kind of light fluffy feel and undeniable Vulgar Display of Power reminiscence.
Erock
The instrumental track "Take Cover Child" was the best of their songs that I listened to. Not much going on at all with the drums, but they do support the guitars well...which seemly fit a decade of power metal riffs into 3 minutes and 45 seconds. Didn't get any feeling like "fuck yeah" from them. They do showcase their ability to navigate the fret board though.
Alas Tyranny
"Domination Liberation Purification" The track "Talent of Deceit" is great for anyone that likes Brutal Technical. They throw in change-ups in what would otherwise be a monotonous, albeit, vicious roll. What I like is they even slow it down. The contrast of the slow parts with the brutal tech parts is a much more pleasing effect than just straight viciousness all the way through, like say, with Beneath the Massacre. The track "Invincible" is a great example. Then you get to the track "The Awakening" and it sounds like an melodic electric opera before gaining a momentum of heaviness. This kind of variation, in my humble opinion, coalesces great styles together without stringently sticking to one, making the album have a life of its own outside of confines. The song "The Heart's Betrayal", along with the rest of the songs, actually have a woman's operatic voice. Its very introspective. I love the sound of her aria with a metal background.
If I have to choose only one among them all, its a tough choice between Under Eden because of their massive potential, rawness, and intricacy...and Alas Tyranny because of their ballsy coalescence of operatic with a technical-sometimes-brutal backdrop. I'm going to go with Under Eden, because its not an easy thing to do to mix opera and metal...and they need to tweak it some more to make for smoother syncopation, like maybe if they focus more on the mastering aspect.