Swarm of Ice Borers
Lvl 4 swarm of tiny elementals - Ambusher
62246
Frigid Mass.

The swarm can occupy another creature’s space and vice versa. A creature that starts its turn in the swarm’s space takes 1d8 cold damage.

  • Impale..

    Half when Bloodied.

The simple icicle moves, unfurling delicate, icy wings. As it reveals a hungry, gnawing mouth full of piercing teeth, dozens more follow suit.

Source: Tome of Beasts III