Boss: Kraken
HP: 1,800
Attacks: Ink, Thundaga, 8 hit physical
Kraken is the weakest of the 4 fiends and by now you should be tearing through him. Set up Protera and Nulshock off the bat to hamper his attacks and then Haste/Temper/Saber your physical attacks. Darkness doesn't seem to do much to your accuracy IMO but watch out for it if it hits all your attackers. Let rip with Thundaga as well but his high MDef might make it less effective than physical attacks. Good Luck!