Disgaea 4: The Promise Unforgotten

I've mostly been doing Item World in low level garbage items (gum) just to see what it's all about but I decided to adventure into a level 44 sword and beat ten floors and when I came out the atk had raised to like +800 :|

Yeah, the +Stats are rather ridic per level, especially with passed "X Growth" bills. Example is Trapezohedron in Disgaea 3.

(3 non-ATK bills, 8 Gladiators)
ATK: 361,314

(3 ATK bills, 8 Gladiators)
ATK: 649,087

3 mere "ATK growth" bills renders a near 300k attack boost alone. The default attack on the upper stat is just from perfect leveling alone, and that's not taking into account max level innocents, which FURTHER increase said stat.
A fully perfect'd character in D3 can get to about 53mil in their main stat.