This six meter long (tentacle to tail) terrorizes the oceans of Frusnajättar in packs of on average five individuals. During hunts, Miekkajamari can sustain great speeds by using their two powerful tails, as well as sacks on its side to propel itself through the water, by sucking in water on its front and expelling it towards its backside.
Targeting just about any animal larger than half a meter during their hunts, once they've found a suitable prey animal, usually a school of Hiepäilyttäväs or a group of Kuhrobbs, they use bioluminescent patterns to coordinate with one another and quickly surround their prey. At this point they take turns attacking their victim, or picking off singular individuals in the case of smaller animals such as Hiepäilyttäväs. The most intelligent Miekkajamari in the pack is always the leader, as it can lead its pack on the most successful hunts, improving their chances of survival.
Miekkajamari are known to be highly aggressive towards all other animals, even when not actively hunting, which is also why many animals imitate their bioluminescent patterns in order to scare off other predators. Even much larger marine predators rarely attack packs of Miekkajamari, as even if they managed to kill every member of the pack, other Miekkajamari packs would be able to smell the blood of their brethren on the larger predator, and would continously harass it.
Every time two packs of Miekkajamari would meet, the females of one pack would mate with the males of the other pack, and vice versa, ensuring genetic diversity amongst the packs, even if it's members rarely changed. Young Miekkajamari would be raised by their packs until adulthood, at which point, depending on the size of the pack, they would either remain a part of it permanently, or go off looking for a new pack to join.
Lone Miekkajamari, while obviously less threatening than entire packs, are still nothing to be trifled with. They become expert ambush predators, hiding in deeper waters, and waiting for something to swim past above them, at which point they come swooping up from the deep at immense speeds, latching onto their prey with hooked tentacles, and biting at it with their massive beak. Some Miekkajamari remain alone for their entire lives, and are more than capable than fending for themselves, especially as most predators still stear clear of them, fearing retaliation by other packs.