The “Phoenix Feather” attack in Final Fantasy 7 Rebirth is actually referred to as the “Rebirth Flame” in the context of the Phoenix battle. Here’s how to counter it effectively:

1. Weaken Phoenix Before Rebirth Flame:
– Eliminate Minions: Before Phoenix can use Rebirth Flame, you need to eliminate the minions summoned by its Breath of Creation ability. These minions have weaknesses that you can exploit. For example, Flans are weak to Fire, while Archdragons are weak to Wind.
– Use Assess: Use the Assess ability to determine the weaknesses of the summoned minions and target them accordingly. This will help you clear the field of these enemies quickly.

2. Pressure Phoenix During Empowering Flame:
– Interrupt Empowering Flame: If Phoenix is using Empowering Flame, throw every attack you have at it to damage it and pressure it. This will help prevent it from using Rebirth Flame by interrupting its Empowering Flame ability twice.

3. Use Ice Magic:
– Ice Magic Effectiveness: Phoenix is weak to Ice, so once you’ve dispatched its minions and broken its immunity, target it with Ice abilities such as Blizzard and summon Shiva for additional Ice attacks.
– Synergy Abilities: Save Synergy Abilities for the Empowered Flame phase as they tend to be effective for pressuring enemies. Using ice magic can help push Phoenix back and make it harder for it to use Rebirth Flame.

4. Healing and Defense:
– Healing Materia: Ensure each party member has Healing Materia to regain lost HP, as you cannot use items during the fight.
– Elemental Materia: Equip Elemental Materia linked with Fire on the armor of your party to mitigate some Fire damage, and link Ice Materia for the Pressured phase.

5. Limit Breaks and Synergy Abilities:
– Use Limit Breaks: Use party members’ Limit Break abilities when available, especially during the Pressured phase, to quickly turn the tide of the fight. This can help deal significant damage to Phoenix and prevent it from using Rebirth Flame.

6. Dodge and Block:
– Dodge and Block Attacks: Be prepared to dodge or block various attacks like Surging Flame, Incandescent Burst, and Rending Talons. These attacks can be devastating if not dodged or blocked in time.

By following these steps, you can effectively counter the Rebirth Flame attack and defeat the Phoenix in Final Fantasy 7 Rebirth.