Spells

there are over 10000 spells and cast magical effects that are usually cast by mages but can be cast by other classes but only limited. 50 for assassin and warrior and 90 for archer

Spell Tier
there are 10 tiers but in pvp no one uses it because although it does alot of legendary effects its way too mana costly and it isn't safe.

each spell tier has 10 levels and to pass levels you need xp and to get xp you need to use it/killing etc  alot and you get a small bonus if you can do secret combos ( usually for beginners)

depending on the level and how its used it can be better several tiers up for example if you have a tier 4 level 10 spell it would be much better to use that rather than a tier 6 level 1 since it takes much much longer and very costly