The Sura is a fighter who came in possession of magic forces when they agreed to let the devil seed grow in their arm. Therefor they are able to swing swords in close combat skilfully, or attack from a distance with black magic.
By specialisation they improve either attack magic or acquire additional strengthening magic.
If you are wanting a PvP (player versus player) machine then you will want to go with the Black Magic Sura. However, for those of you who want a PvM (player versus monster) machine, that requires a Weapon-Sura.
Status build suggestions
Weapon-Sura skill (Suggestion):
VIT: 1 (max second)
INT: 2 (max first)
STR: (for dmg: max third)
DEX: (for tankiness: max third)
Magic-Sura skill (Suggestion):
Weaponry And Black Magic Sura