For example Crimson Sabre or Crimson TwoHand Axe.
http://db.irowiki.or...tem-info/13454/
http://db.irowiki.or...tem-info/28106/
Notice one of the provisions says "ATK + (Upgrade Level * Upgrade Level) up to a maximum Upgrade Level of 15".
What does that mean? How do we calculate the overall total ATK of the Crimson weapon when taking that provision into consideration?