to reach high damage equip lance with a lot of m attack items then use nats kyon limit break and use lances nuke limit break. to reach even more dmg use all the cakes on lance
if you level everything to level 20 the cap of leveling increases by one meaning level 21 is now max. it requires 99999 exp for each of the upgrades. If you upgrade attack you release three beams each dealing 999 if you choose to upgrade life all damage is reduced to 1, if you choose to upgrade magic than your dash will cost 1 mana after upgrading all three of those your experience says max