[Manistic]

How my group plays it is that while we can't affect the individual - direct monster enhancers are A'ok. One-shots are not.
Our reasoning is simple: you are in another dimension, you can't help or be helped by your friends, because you are in another dimension, but that does not mean you won't run into a monster and their mate, and their child and their mom, etc. Or that you won't run into a friendly version of the monster. Monster enhancers are not one-shot items. They are something that can be argued to be inherent to that particular monster at that particular time and place.
One-shots on the other hand are items that a person physically had to use to enhance either side of combat.