BS15 Fenneborac (AND The LoveGoddess Lofn)

028 Fenneborac, Sp. Type: Machine Beast
[Lv1-Lv2] (When Blocks) For each color of spirits on your opponent's field, this spirit gains + 2000 BP.
[Lv2] (Opponent's Turn) When your opponent sends cards from your deck to the trash, by exhausting this spirit, no cards will be sent from your deck to the trash.

second effect not detailed wording. does it count ONLY for one attack (from a blue spirit/crush), or does it count in general for entire turn no matter how many of those effects activated by my opp?

(same goes for "The LoveGoddess Lofn")

It only works for one attack.