When party member first receives ordinary melee attack, applies to attacker:
'Seal of Judgment' that can't be removed.
Atk. Spd. -23%.
Duration: 5 sec.

If attacker is already affected by 'Seal of Judgment', it is not reapplied. Instead applies to attacker:
Incoming Damage +12%.
Duration: 5 sec.

Can be applied only to party member.
Can't be used for 30 sec after joining a party.
Effect only works while in a party with the caster.