Here's an all-inclusive guide for defeating the Terror of the Deep in "Final Fantasy 7 Rebirth," including requirements, a detailed walkthrough, strategies, and tips:
Requirements:
Terror of the Deep Boss Guide in Final Fantasy 7 Rebirth
•Location: Encountered in Under Junon during Chapter 4, "Dawn of a New Era."
Party Composition:
•Cloud - Essential for melee and some ranged attacks.
•Aerith - Provides healing and ranged magic attacks.
•Barret - Good for ranged damage and can disrupt the boss's attacks.
Materia:
•Lightning Materia: Terror of the Deep is weak to Lightning, so equip this on multiple characters.
•Healing Materia: Aerith should have Cure or Pray Materia for group healing.
•Assess Materia: Useful to learn about the boss's weaknesses and resistances.
•Level: Around 20-25 should be adequate, with proper Materia setup and character upgrades.
Detailed Walkthrough: 
Terror of the Deep Boss Guide in Final Fantasy 7 Rebirth
Phase 1:
1.Initial Attacks: The boss uses melee attacks like Tail Lash and Grasping Tail.
2.Strategy:
3.Use Cloud to attack from the air with his dodge (circle) + attack (square) combo.
4.Barret can shoot from afar, maintaining distance while building stagger with Overcharge.
5.Aerith should heal and cast Thunder spells to pressure the boss due to its lightning weakness.
6.Water Cell: The boss traps party members in Water Cells, rendering them immobile.
7.Action: Switch to another character and use magic (preferably lightning) to break the cell.
Phase 2 (around 50% HP):
Terror of the Deep Boss Guide in Final Fantasy 7 Rebirth
1.Oceanic Tornado: The boss submerges and creates a central water tornado with smaller ones around.
2.Strategy:
3.Dodge the smaller tornadoes by keeping on the move.
4.When it pops up from the water, immediately hit it with Lightning spells to pressure it back into the air.
5.New Attacks: Adds Aquatic Twister and Gnawing Fangs:
6.Aquatic Twister: Jump or dodge this area attack.
7.Gnawing Fangs: Quickly attack the tail to free captured allies.
Phase 3 (Final Push):
Terror of the Deep Boss Guide in Final Fantasy 7 Rebirth
1.Aggressive Tactics: The boss uses all previous attacks more aggressively.
2.Strategy:
3.Keep up the pressure with Lightning spells, focusing on the head when it's in the water.
4.Use Limit Breaks, especially Aerith's Healing Wind for recovery or Cloud's Cross-Slash for damage when the boss is staggered.
Strategies: 
Terror of the Deep Boss Guide in Final Fantasy 7 Rebirth
•Exploit Lightning Weakness: Use Thunder, Thundara, or summon Ramuh if available.
Stagger and Pressure:
•Damage the tail fin to pressure the boss, especially when it uses Grasping Tail.
•Use abilities like Cloud's Triple Slash or Barret's Focused Shot to build stagger when pressured.
•Synergy: Utilize Aerith's Radiant Ward for doubled spell effects, particularly with Lightning spells.
•Defensive Measures: Ensure you have enough healing or use Barret's Steelskin for damage reduction.
Tips: 
•Character Switching: Swap characters to deal with different phases of the fight; for example, switch to Cloud for aerial combat or Barret to free allies from Water Cells.
•MP Conservation: Try to use ATB for abilities rather than spells for healing unless absolutely necessary.
•Positioning: Stay away from the center during Oceanic Tornado; use the edges of the arena for safety.
•Limit Breaks: Save these for when the boss is staggered or low on health for the highest impact.
•Ranged vs. Melee: Balance between Cloud's melee to stagger and Barret/Aerith's ranged damage for safety and continuous damage.
•Summoning: If you have Ramuh, summon him to deal significant lightning damage and control the fight's pace.
