Can a House of Dreams location be canceled or stopped? For example, could River Blockade stop bear island? Or could Alannys cancel it? I was told that the location is immune, but it's ability is not. So it could be stopped or canceled. Jsut wondering if this dude was wrong or not.

The dude's right: immunity: does not cover abilities.

Ok, thanks for the help

I'm not sure I understand Khudzlin's response. A House of Dreams location is immune to non-plot cards. Therefore they can't interfere with the card in any way, including the ability. River Blockade would attempt to directly interact with Bear Island's ability and House of Dreams would deny it. It would also consume River Blockade if it's the first location ability triggered.

If Khudzlin's interpretation were correct, then you could He Calls It Thinking when The Red Viper tries to save. I don't believe that is allowed.

mdc273 said:

A quick glance at the FAQ often helps in these kinds of situations:

(3.19) Scope of Immunity
Immunity only protects a card itself. Peripheral
entities attached to or associated with a
card, such as attachments, duplicates, power
counters, gold tokens on the immune card,
and also including triggered effects originating
from the immune card , can still be affected by
cards of the type to which that card is immune,
as long as the affecting cards do not target the
immune card.

Page 10. Emphasis mine.

Yes, you can cancel triggered effects originating from the immune location, and you can cancel a dupe save from TRV with HCiT.