Use one of the Bolt-type spells. Homunculus decides randomly which one it uses, you can not influence its decision. The skill level used for the random Bolt-type spell depends on current skill level of Caprice.
Increase your Homunculus's INT and STR. Also helps on creating potions, the bonus is +1% per skill level if the Homunculus is active.
+1 INT/ +1 STR
+2 INT/ +1 STR
+2 INT/ +3 STR
+4 INT/ +4 STR
+5 INT/ +4 STR
Bio Explosion(Skill ID# 8016, iRO Name: Self Destruction)
Use Weapon Property
Homunculus self destructs and inflicts defense ignoring damage on everything within a 9x9 cells around it. The damage is based on the Homunculus Maximum HP, and after the attack, its intimacy is reduced to 1.