using gooey blob
A tactic is to trap a number of creatures within the blob, and then as it is about to dissipate (having reached maximum size), set fire to it with fireball, dragons breath, lightning, meteor shower, fire elemental, or a flaming arrows fired by an elf lord.Gooey blobs are flammable. If they are set alight, any creature caught in the blob will get damaged by the fire.