function RetainerJewel_OneHandedDamageBoost()
    if env(GetSpEffectID, Jewel_of_the_Resolute) == FALSE then
        act(ClearSpEffect, 390006)
        return
    end

    if c_Style < HAND_LEFT_BOTH then
        act(AddSpEffect, 390006) -- One handed damage boost
    elseif env(GetSpEffectID, 390006) == TRUE then
        act(ClearSpEffect, 390006)
    end
end