Help with getting an item in my game.

[K_I_R_E_E_K]

By using weapons you need to hit the 3rd attack in a combo, one easy way to do this is to get an untekked item such as "???? gladius +1" and do special/special/normal, you will miss the 1st and 2nd strike and hit on the 3rd attack, the enemy will split.
Techs are also an easy way, i'm not sure if all techs split them, you can try, i use rabarta to split them.
Once there are 4 slimes, pipe and repeat the process.