When equipped with Good Spell:

Increases damage of Eternal Slash by 20%.
Increases damage of Savage Impact by 40%.
Increases physical damage against enemies of every element by 20%.
Critical +5.

[iRO Description]
Set Bonus:
Good Spell
Good Vigor (Shadow Cross)

increases Eternal Slash damage by 20%,
increases Savage Impact damage by 40%,
increases physical damage against all property enemies by 20%,
CRI +5.