Overlord Dharma led Lulu and Jason to handle the Dream Reaper. They had a small team, but it was enough from Klaus's perspective and knowledge.
Overlord Dharma is one of the strongest spirit masters in the world, so this battle was a perfect fit for him.
Of course, Lulu, who is also a spirit master, was meant to support him, with Jason acting as the ultimate backup.
He is a swordsman just like Miriam. They both use the light element.
So he was meant to stay far from the battle while Dharma and Lulu handled it.
Their opponent is a beast that relies on illusions, such as dreams, to hunt. It doesn't physically attack, so to defeat it, they were required to overcome the illusions and get closer.
They are two powerful spirit masters, so Klaus assigned them to handle it.
On the surface, that was easier said than done.
It turns out Klaus's intel was flawed this time, and because of that, they are now trapped in an endless battle against dream spawns.
