Oh lmao, shame on me for skimming! XD
- - - - - -
Anyways.. I looked
this up instead.
"In order to obtain an Atma, elemental Weapon Skills must be used to yield a !! over the enemy's head. Atma are guaranteed to drop after exploiting this weakness
once.
Once you've obtained an Atma, and you possess the key item Lunar Abyssite, you may have the Atma activated."
Hope it helps!