Purely dungeon, PVP, PK, War kind of game. Nothing too complicated when it comes to tactics (this isnt slashing-and-evade game, its just HIT HIT HIT), all you need is good grasp of your overall stats mastery - which includes how you compare your stats against foe. Believe me, when you rise up the ranks - theres gonna be more than a handful of stat types you need to learn, including item stats. You can build your character as a dungeon main, or PVP.
Has a mediocre story (kind of interesting, although the writing could use some improvement) - whats unique is the setting and the world itself. You get treacherous wild environment - all of a sudden, you join your teammates on a quest to slay advanced a.i robots. You're gonna see a lot of "astral" in this world.
Cabal has different GM's managements, according to where you are. Whats fair to say is - the "luck" system is really hell. But still, well within "calculated risk" range. Theres always events in cabal, players gain many benefits from them!