For the curious . . .
Spoiler
Show
My players infiltrated an enemy fortress disguised as the enemy's elite guards. However, their ruse was blown instantly because the elite troops use special magic equipment that the players couldn't replicate, and they were recognized as phonies. This led to combat in which the players were victorious.
My questions in this case: Did the recognition that they were fakes cause someone to see through the illusion? Did the combat cause the illusion to vanish? One of the PCs has a glass eye, or in this case, he's a dwarf with a giant emerald eye. Was that visible through the illusion? The enemy is going to be using "Speak with Dead" on the killed troops, they'll want to know who was responsible.