Lucivar and the others geared up as they were a part of the earliest party to depart.
He was allowed to wear slightly better armor due to him being the leader of the party—and also choosing a weapon of his choice, which led him to end up, with dual-wielding. One is a short sword while the other is a dagger.
Remembering his fight with Namira, he dreaded a direct confrontation.
Even his abilities weren't fit for such a situation.
His Snare and Radiant Burst abilities were tailored for instant kill attacks—assassination.
One is to bind someone in place while the other is to knock someone back.
Of course—his immense ether empowered by Loki's strands—was able to make the Radiant Burst a lethal offensive attack but innately, the ability was tailored to push someone back. It wasn't made to explode limbs.
Keeping that in mind, he chooses the dagger as his weapon of choice.