-Every character has one super weapon that can be obtained by fully upgrading one of his/her stock weapons.
-Every player has seven stock weapons but the final result after maximum upgrades yields the same super weapon.
-Upgrading is done through the shop at save points. There are two parts to upgrading:
(1) Spamming items which give a low amount of EXP to increase multipliers, and (2) Using items which give a lot of EXP, and that now give even more EXP due to your multiplier, to upgrade your weapon substantially.
-An effective way to build the multiplier is to go to the Creature Comforts store and buy Vibrant Ooze. Apply 36 of those to your weapon and you will have a 3x multiplier. Then you can apply Perfect Conductor for 2577 EXP.