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.2d6+9.
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