"We're the most dangerous when batshit weak!"
At Inala's words, Virala became calm, thinking of the time when he was targeted by Brandal Brimgan. A moment later, he stared at Inala, "The Brimgan Empire should have the means to perfectly lock our Spirit Containers. Brandal Brimgan was an expert in the field and I think Boul Brimgan might be able to do it too."
Spirit Container Lock!
It was an ability on par with a Nature that was conceptualised by Brandal Brimgan, one that used a combination of his eight Minor Treasures to accurately target the opponent's Spirit Container and seal it.
When that was used on Virala, he was unable to transform and even harness his Prana. If not for Brandal Brimgan's desire, which allowed Virala to take advantage and eventually free himself, he could have still been trapped in the Brimgan Empire's prison.