In order: Lo-def(inition) Discord; Off Kilter Enhancement; arc'tan'gent; IV
Also a really cool deck of playing cards released to promote IV.
There's also the For Cause and Consequence EP, but it's digital only.
It's a band that's not really that well known. While arc'tan'gent has become somewhat of a cult classic, they've kinda been forgotten since they originally split up in the early 2000's shortly after that album.
Although I haven't been a fan for long, I'm very happy that they reunited recently and released IV last year, which was their first album in 13 years. They've got a very unique sound that blends hardcore, progressive metal and alternative metal, and while their music can perhaps sometimes lack the complexity associated with prog, they're still very fun to listen to.
On another note, I need to stop trying to take pictures of my CDs in the middle of the night because that never turns out well. Unfortunately, that's usually the time I get the urge to make an entry showing off something from my collection.