Jokatgulm serves as a boss in Dante's Mission 4 and Lucia's Mission 3. This fight is completely scripted with both character. Although, Dante has risky method which highly depends on his current health state after entering the room.
NG+ Note: Round Trip / Aerial Cross trivializes this fight.
It's very important to have your starter weapon upgraded as Lv2
Each Tentacle has 1,500 HP, the idea is just to focus on two at a time before attacking the main body, but it doesn't matter when it is Dante or NG+. Therefore, both character has different approach.
Dante has two methods: Safe Majin which is consistent to set up, but that is much slower than the Risky Majin.
Safe Cycle Fireballs
Risky Cycle Melees
Ideal Jokatgulm with Lucia
It's good to check the Frequently Asked Questions (FAQ) if you have general questions regarding the bosses.