As you all know Starfrost was born to Larksong and Frostfire. And that Nightwing took Starfrost from Larksong when his own colt was born dead. There is what happen after joining River Herd.

1. Starfrost can see  a meadow and see if it can be used by a herd.
2. Starfrost knows all of all the herd's secret.
3. Saved many Pegasus from a fire.
4. Knows when and how to keep peace.
5. When on the battlefield he will give a sever injury to steeds but will not kill them.
6. Knows Sky-herder secrets.
7. Has protected Riverleaf from the evil Bloodwing's Plan to mate her with Warwing.