Final Fantasy 7 Rebirth Terror of the Deep Boss Fight (Chapter 4) in Under Junon, plus MindFlayer boss from classified intel, both on Normal difficulty. This Chapter 4 boss can be defeated quite fast, but the game restricts you from damaging it any further once you get it to about 25% health. This is so that it goes underwater, into it's second phase.
The MindFlayer can be a problem if you don't have enough to activate Synergy Abilities. Synergy Abilities is the method to interrupt it's Psychotic Break attack, which can do up to 2,000 damage. My equipment loadout for the MindFlayer battle is shown after the fight.

0:00 Intro
1:37 Terror of the Deep boss battle
7:25 MindFlayer
9:07 Synchro Cyclone synergy ability
9:32 Avalanche Two-Step synergy ability

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【XCV//】- Video Game Specialist. Walkthroughs (no commentary + high-quality), Game Movies, Achievement/Trophy Guides, etc.