Transformation mastery question

I just got a legendary material for Transformation Mastery from a power spell. Here’s the description:

“Creature has a 50% chance to gain each of the enemy creatures’ abilities at the start of battle.”

Is that 50% chance to get them all and 50% chance to get nothing, or is there a separate 50% chance for each enemy? I’d much rather have it the second way, so I could reliably get at least something. The first way is a bit too unpredictable for me.

Thanks!

There’s a separate roll for each enemy.