Orrish Worm Swarm (small-large earthworms – up to 2m long!)
3rd level conjuration (2nd with off-grub sacrifice)
AC 10 HP 4hd+3 / 25hp
Resistance: All Bludgeon/Slash, magical piercing
Immunities: Piercing
Can be sacrificed for https://dnd5e.wikidot.com/spell:earth-tremor
Can enact Mold Earth cantrip each round if in soil
Create 20×20 area into difficult terrain
loosen/xcavate 5’ cube
Trap a single SF 3 or less; DC 10 dex save or considered restrained; full move and action to dig out
https://roll20.net/compendium/dnd5e/Conditions#toc_12