It can have an effect in one particular location of the game.
Now I’m out of here, I already said too much ;)

You are probably right. It's more of a vague feeling of wanting to have it as "complete" as possible.

Yes, I've read about this and was in that area and noticed... nothing.

I know nothing more about it actually, I didn’t even came around that area yet.

Errare humanum est ;)

I actually had to check the KS page to find the right price tag for the exclusive pet.

I backed the game at the Digital Collector's Edition tier which includes the pet. I used the royal edition code on steam and the hero edition code on gog. I prefer drm-free copies of my games, but it sometimes takes a while for gog to release new patches, so I used one of my keys for steam. Since all the things included in the royal edition can be downloaded from the backer portal, I figured I didn't need to worry about which code I used for steam. Unfortunately it seems the kickstarter dlc is based on the edition of the game... I know the pet is just cosmetic, but it still sucks... I'm not sure if there's anything that can be done about it though...

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Yes, I've been wandering around graveyards with the thing too and haven't noticed anything. There are several places that can be described that way, though, so maybe I just haven't tried it in the right one. I'm done with it though. I don't care anymore.