Number Soul

Number Soul is the Double Soul MegaMan.EXE performs with NumberMan.EXE by sacrificing a Plus Battle Chip (like Atk+10) in both MegaMan Battle Network 4 and MegaMan Battle Network 5. MegaMan gets 10 chips in the selection screen, and +10 attack for neutral element chips. It's not too good in the beginning, but with a couple of Atk+1 programs from Navi Customizer and some Buster Ups Battle Chips, the power really adds up.
 * Charge Shot: Dice Bomb (This is rolled into the enemy area, and after a bit of time, explodes, covering a 3x3 area. The power is equivalent to the number on the dice x10. In MMBN5, the multiplier increases by 5 for each additional Buster level.)
 * Weakness: Charge Shot takes some time to detonate, and is too dependent on the die roll.
 * Bosses to use against:
 * Any boss - Having 10 chips to select is always helpful. Number Chaos' Charge Shot is also devastating when used in conjunction with chips that hit multiple times, particularly the Infinite Vulcan Program Advance.
 * Number Chaos: By sacrificing the DarkPlus Darkchip, Megaman performs a Chaos Unison with Number Soul. His Charge Shot becomes DarkPlus, adding 50 attack points to the next attack every time it's used, including Program Advances, so long as the chip or advance has a visible attack power. However, because of its extremely unstable charge, it's difficult to avoid a misfire, undoing the Chaos Unison.