Inside the Enemy's Plans 

In the blink of an eye, Blood and Smoke devoured more than half of the spectres that had appeared in the area as a result of the ritual performed by Lothur.

Lothur had helped them prevent some of these creatures from escaping, but Blood and Smoke were powerful enough to deal with a group of level 20 and 21 spectres.

By the time they acted, the weakest spectres in the area had already increased their levels to become level 20 creatures. The level 20 ones had also improved, and only the level 21 ones were unable to advance, as it was actually more difficult to advance to the 5th stage.

In any case, their killing had been quite clean and quick, as they filled their bellies five minutes after their creator's approval.