Stench of Mordor

[Shapeshifter]

Environment. At the start of its site phase, each company at a site in a Dark-domain [d], (or Shadow-land [s] if Doors of Night is in play) must tap one untapped character if available. Discard when any play deck is exhausted. Cannot be duplicated.

bolds are mine

What does this or if DoN are in play mean? I always thought it is to be read as additionally. Yesterday my opponent pointed out that he thinks it is meant in the way of instead.

[marcos]

Environment. At the start of its site phase, each company at a site in a Dark-domain [d], (or Shadow-land [s] if Doors of Night is in play) must tap one untapped character if available. Discard when any play deck is exhausted. Cannot be duplicated.

bolds are mine

What does this or if DoN are in play mean? I always thought it is to be read as additionally. Yesterday my opponent pointed out that he thinks it is meant in the way of instead.

I think that its intention is the way of additionally as you said

[Konrad Klar]

Affected is each company at:
a)at site in
or
b) site in if Dooors of Night is in play.

None of companies cannot be simultaneously at a) and at b).

[Wacho]

It means additionally. Considering Doors in play it would read like this, "At the start of its site phase, each company at a site in a dark-domain or shadowland...."

If it meant instead the card would probably read "alternatively"

[Shapeshifter]

That was my assumption, too. Thanks for your answers.