Lightning/Fire/Heuksal is more like a PvE build, it won't do so well in PvP.
Ice will give you more phy def and dmg mp consumption.It is good in PvP.
Force gives you more def, atk, hit and parry by putting debuffs on enemies. It is the best glaive build in pvp.
Ice wall absorbs phy dmg. So if u have it on and an enemy hits hard with a phy attack, he hits quite much, but the dmg you recieve is much smaller or 0 because of the nice amount of hp of the wall. When the hp of the wall runs out, it disappears. Mag attacks don't do so much dmg to the wall and it takes a lot of dmg to take it off. Ice wall is also very good against warlocks cos they can't put a single debuff on you when you have the wall on(DoTs still go on though) and they can't take it off either since they only have mag attacks.
Fire wall is the other way around, it absorbs mag attacks and so on.
