Talk:Christmas 2017 Event/@comment-87.21.9.62-20171213152218/@comment-182.30.101.182-20171213153009

Apparently it's

Buster Up to self (1t) (Overcharge+)

Powerful attack to all enemies (Level+)

ATK Up to all allies affected by [Protection of the Underworld] (3t)

It's very likely that Protection of the Underworld will be caused by at least one of Eresh's skills.