Dragon's Soul

//Got board so here's a unique skill I came up with tell me if you think it might be OP or even under powered

Dragon's Soul is a unique skill that gives the player a boost to their Attack, defense and armour. It is unknown how to get this skill it will just appear in one's skill list.

Description
Dragon's Soul is a passive skill which add's 0.5 attack, defense and armour bonus each level to a maximum of 500 when mastered. The power it gives you may double for a short time depending on the willpower of the owner. In addtion to that it also gives you a +1bonus to all base Statistics every 250levels (willing to remove that). It also gives you a godly glow when equipped starting of faint and slowly getting brighter every level.