Great Battle vs. Sephiroth

Great Battle vs. Sephiroth is a series of ten quests in Kingdom Hearts Unchained χ / Union χ, in which players need to defeat Sephiroth. It was available from April 16 to 26, 2020 in both versions.

Extra rewards were sent to all players based on the number of players that cleared all objectives.

Number of players	Rewards
1,800+	Power Gem x30 Speed Gem x30 Magic Gem x30
1,400 - 1,799	Power Gem x15 Speed Gem x15 Magic Gem x15
1,000 - 1,399	Power Gem x10 Speed Gem x10 Magic Gem x10
600 - 999	Power Gem x5 Speed Gem x5 Magic Gem x5
200 - 599	Power Gem x3 Speed Gem x3 Magic Gem x3
1 - 199	Power Gem x1 Speed Gem x1 Magic Gem x1