Tundra Herd's history:

Descendants of Mountain Herd, Snow Herd, and Desert Herd. A  two year war against the three herds, fighting for... something. Jungle Herd and Sun Herd joined up and put a stop against the battling territories. But there were rebels in each battling herd, already protesting against their over-stallions for peace. Once the three herd rebel groups heard that there were steeds willing to join each other to put an end to the war, they gathered and became one small herd, Tundra Herd. The steeds live in the ice lands, where Star once led his followers in hiding from the other herds. Now they survive there, their herd gradually growing throughout the seasons.

The Tundra Herd Steed:

Their bodies are thin and chests are deep for traveling through the sky at high altitudes. The steeds' hides are thick for the piercing winds and burning sun rays. Much like the Desert Herd steed, their feathers are tough and their hooves are hard as stones. The steeds stay in the cool colors of coats and shades in feathers to match their freezing territory. XD