The Titan of Ice and Mischief Loki, the World Boss Fenrir Unchained, Skoll, and Hati all charged towards the Flame Giant Surtr. They had to stop the Flame Giant Surtr from plunging his sword deep into the divine domain of Asgard. The reason that all of them risked their lives from doing this is one secret that the Titan of Ice and Mischief Loki kept from all of the beings here.
The Titan of Ice and Mischief Loki could only become a titan without any problems because his divine source is tied to the divine realm of Asgard. This is the same for the World Boss Fenrir Unchained which means all beings summoned by him is also tied to the divine realm of Asgard. In essence, the only reason the Titan of Ice and Mischief Loki, the World Boss Fenrir Unchained, Skoll, and Hati are alive is due to the fact that they are one with the divine realm of Asgard.
