If a Fear cards tells you to add Strife and then do something to pieces with Strife, does that affect just the newly-added Strife?
If a Fear cards tells you to add Strife and then do something to pieces with Strife, does that affect just the newly-added Strife?
No, it affects all pieces with Strife anywhere on the board, whether or not you put a new token on it.
Remember that Strife, unlike the other tokens, is always assigned to a particular Invader.