I am running House of Dreams with Corpse Lake as the location and this is the only location in play.

My opponent plays Enemy of My Enemy and declares ' each opponent chooses and discards a location he or she controls with printed cost 1 or less from play'

1) Is Corpse Lake immune from this event card or can it not in fact be targeted ?

2) If i had other 1 cost locations in play could i choose Corpse Lake and then declare it's immunity ?

Thanks

You cannot choose (as the target of an effect) a target that is immune to the effect. Just like you cannot choose an cannot be killed Beric to satisfy military claim, you cannot choose Corpse lake "then declare its immunity".

Immunity in this case extends to being chosen as a target by it, and being affected by it (if, say, it didn't need to choose a target - like TRV and Westeros Bleeds).

This is all pretty clearly defined in the "scope of immunity" entry in the FAQ.

Edit: Don't know why I said Beric was immune.

And since your opponent is playing the event, the immunity granted by HoD applies, regardless of who chooses the target.

You cannot choose (as the target of an effect) a target that is immune to the effect. Just like you cannot choose an immune Beric to satisfy military claim, you cannot choose Corpse lake "then declare its immunity".

Beric is not "immune" to things that would kill him (like military claim). Immunity and "cannot be killed" are not the same thing, although they have similar practical effects on gameplay.

(Similar to "cannot"), immunity does two separate things:

1. Makes the immune card an illegal target of whatever it is immune to, and

2. Allows it to ignore the direct effects of whatever it is immune to, targeted or not.

For immunity, it never matters which player is choosing the target for the effect - only what type of effect is making/allowing any player choose.