Battle Siren, Orthia

(This ability is active if you have one or more face up G units in total on your or G zone):[ 1 & 1] At the end of the battle that this unit boosted ([Boost]) a rear-guard, you may pay the cost. If you do, choose one of the boosted ([Boost]) units, it, and that unit gets -5000 until end of that turn. (Even if you do not pay the cost, this ability cannot be used for the rest of that turn) //:Resist (This unit cannot be chosen by the effects of your opponent's cards)