Small elemental humanoid (cold)
Elemental Companion

HP 1; a missed attack never damages the companionDefenses your defenses, not including any temporary bonuses or penalties
Speed land 6 (ice walk)

Passive Benefit: Frost Armor

You have ice walk while you shift, and you have resist 3 cold (6 at 11th level and 9 at 21st level).

Active Benefit: Minor Action (zone) Encounter

Effect: The arctine creates a zone of difficult terrain in a close burst 1. Creatures with ice walk are unaffected. The zone lasts until the end of the encounter or until the arctine leaves the zone, dies, or enters passive mode.

Published in Heroes of the Elemental Chaos, page(s) 147.