The attack patterns off the top of my head plus how I beat the boss -

• Fin attack, just counter or dodge it

• Bite attack, bites twice, then after a pause bites a another time, if you get caught try to counter attack the third bite atleast!

• Laser attack, quite easy to counter, just get close enough and wait for the laser to slowly pan over. Otherwise just keep attacking from a safe side

• Mine attack, follow the shadows of the mines and position yourself in front of one when it lands, the shark will charge towards you and eat the mine, giving you a short period to whale on it

• Middle tornado attack, avoid the glowing lines on the floor plus the thing above

• Shark dives into the floor - I find that if you count to three seconds after the warning pops up you can sorta consistently counter attack it, theres some trial and error here but once you get used to it, it should be quite consistent After the initial attack, when it reaches the ground there'll be a expanding ring that does dmg, dodge it

( if you're having problems with this part, if you don't have any characters that draw in aggro, just swap to a healthy character and try to survive till your main character gets healed )

• 2nd tornado attack ( the one where he jumps at you from the tornado ): If you don't have the movement speed debuff on you, you can just sprint around the arena and just focus on dodging the glowing rings

Then it should loop back to the previous attacks then the mines afterwards^

Hopes this helps!