Many of these mounts have a source listed as from the Trading Post, which is a new "Battle-Pass-like" system coming in Patch 10.0.5.
NEW Skyskin Hornstrider
Description: The instability of primalist storms in potential timelines sometimes causes creatures to absorb the energies from the very storms. These creatures tend to be docile towards those who are able to face the fury of these chronomatic anomalies.
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