Most of the time, brains beats brawn. You're not going to survive just by pulling a Rambo and try to kill the boss with pure force. You need to wear him down, piece by piece (even if it's tedious and repetitive), and play the long game.
The only way is to attack them from their bank account, you see!
Because then they have no funds to purchase He-man collectibles, and from then on they’re ruined...
[spoiler]perhaps you could join the void...[/spoiler]