It took a while for Nial to prepare everything to activate the Awakening of the Prymal ability.
The power of his abilities had increased drastically after he advanced to the Keltia rank. Each of his linked abilities grew stronger, including Awakening of the Prymal.
It was a little easier to control the ability now, though on the flipside the consumption of energy had increased exponentially. This was only obvious since he would be able to summon Mythician-ranked beings through the Awakening of Prymal ability.
Nial was not sure which rank the Shadowmancer would be, let alone where Dexter was sealed in the first place, but Kaeldur mentioned that there was no need to worry as long as he set aside more than enough Origin crystals.
Nial had collected millions of Origin crystals during the last few years. He didn't really need to use them, which was more than enough reason to put some of them aside.