TL'd rebalance notes by English Wiki Discord:

Shamash
Burst - 100% Reduces 1 charge turn (orb eat).
Equal Talionis - Decreased duration of taunt from 5 turns to 3 turns. Damage cap increased to 250k
Rexa Pride - Counterattack effect improved
Assist - Further Increased Aggro

Nephthys
Burst - Clears the cooldown of Fearful Impact
Fury Turn - Max DMG↑ buff added

Tyr [Awakened]
Burst - Guaranteed Triple Attack (1T) added
Stanshocker - Increases accuracy on DEF debuff (180sec), Mode Gauge↓ removed and Lock-on debuff (90sec) added
Rune Teal - Changed ATK↑ to Thunder ATK↑ + Max DMG↑
Finishing Pact - Changed "DMG vs Stunned enemies" to "DMG vs Locked-on enemies"

Amon [Unleashed]
Burst - Dark ATK↑ (+20%) to all allies
Curse - Light ATK↓ (-15%) to all enemies added and Stun Extend changed to All enemies, as well.
Catastrophe Fist - Cooldown reduced from 8 to 6 turns and DMG multiplier increased from 4,5~5,5x to 7~7,5x. Damage cap increased to 800k.
Hades Destroyer - Target type changed from one enemy to all

Jupiter
Impulse Pierce - Cooldown decreased from 8 to 6 turns. Damage multiplier increased from 4,5~5,5x to 7~7,5x. Damage cap increased to 800k.
Resolution - Burst Gauge increased from 20% to 30%
Reinforce - Duration increased from 3 to 5 turns

Vishnu
Burst - Changed DEF↓ to 2000 HP Barrier (4T)
Assist - Changed from "Removes all buffs when getting hit" to "Removes her own buffs when receiving DMG"

Sati
Assist - Increased Crit Dmg multiplier.

Zephyrus
Infection Gail - Target type changed from "One Enemy" to "All enemies"

Dragon Slave (Sieg HP Hammer)
Old effect removed,
Ab 2 - Additional effect: Party Atk up
New effect,
Ab 2 - Additional effect: Party Rage Punisher Buff

Balmung II (Sieg Atk Sword)
Old effect removed,
Ab 3 - Increased Dmg multiplier
New effect,
Ab 3 - Now activates Twice

Ars Nova (Solomon Hp Staff)
Old effect,
Ab 3 - -1 CD
New effect,
Ab 3 - -1CD + Effect increased