I seem to be virtually incapable of beating the JK with the gear that I have, so I looked through the wiki and I think that I found the ideal loadout:
Sword: Acheron, Dread Venom Striker or Gran Faust
Gun: Umbra Driver
Armor: Skolver Suit
Helm: Skolver Cap
Bomb: Graviton Vortex
Shield: Aegis
Can somebody determine whether this is a good set? If you have any suggestions, just post them. If you are good at the JK, your loadout is appreciated also.
Um I'm sorry but if you need those weapons and armors to beat Jelly King then there's a bigger problem at work here. Generally Piercing defense is more used for Jelly King since the levels before him are full of Piercing attacks. As far as I know Jelly King himself can only do Normal damage but that doesn't stop the minions from attacking with piercing. The Barbarous Thorn Shield would be more worth it than the Aegis since they have similar stats but you get a sword bonus from the former.
While Shadow does do extra damage, it doesn't do that much extra damage just as piercing doesn't do that much less damage to the Jelly King. The Venom Striker is good but having 3 Poison Vials will do just as well. Guns aren't all that helpful against the Jelly King, I only ever use one to apply status which the Umbra Driver can't do. In reality a Calibur will do just fine against the Jelly King.
To beat Jelly King you just need to know its attack pattern so that you can slash at him while shielding when he's about to attack. Curse, Poison, and Fire vials are very helpful against him. Poison stops him from healing, Curse damages him while he attacks (helpful during the berserk spinning stage of the fight), and Fire helps tack on extra damage. When the Jelly King goes pink and starts spinning he's invincible so you'll only want to run away. When he's done, Curse him and hit him one or two times before shielding again since he'll start to spin more. If you have a Calibur its often good to follow the King as he's spinning while charging your sword so that you can unleash very heavy amounts of damage on him when he finishes spinning.
Forgot my loadout. I solo'd Jelly King using 3 Poison Vials, 3 Fire Vials, 3 Curse Vials, and 3 Health Pills.
2* Cobalt Helm
3* Chroma Suit
3* Twisted Targe
3* Arc Razor