Skills
Vile Rush is one of the first skills you’ll unlock for Oswald in Odin Sphere Leifthrasir, and it’s a pretty handy one at that. It allows Oswald to perform forward slashes that gradually intensify. This is a great skill for staggering bosses, and it also helps with large mobs. One thing to note is that Oswald can occasionally overshoot enemies with Vile Rush, but you can rectify this by holding back on the D-pad so get him to perform his final slash in that direction.
Serpent Grief is another skill you’ll definitely want in your arsenal. This skill conjures black flames that leap forward from the ground. Again, this one is good for mobs, and setting up air juggles. The black flames will usually strike from below, launching your enemies into the air, allowing you to jump up and perform an air combo.
If you enjoy using Berserk Mode, I recommend putting points into Extent of Madness as well. This is a passive skill that increases the duration of Berserk Mode. The increment goes up with each level, so it’s wise to level this up as soon as you can to get the most out of it.