However, it's all worth it.
Casio has summoned yet another Shadow Demon troop, the majority of which are at the Claw Level, but there is also a small portion at the Red Eye Level.
They may prove to be markedly effective in dealing with dark creatures.
The aura from one creature of a kind is most sensitive to another of the same kind.
Just like how Casio, being infested by a Shadow Demon, has become particularly sensitive to the aura of dark creatures. The same logic applies now.
The soldiers of the Shadow Demon troop have better abilities to detect and track dark creatures, which is very helpful once the general area has been determined. To hunt dark creatures with dark creatures, Casio sees this as a stroke of genius.