Winterspring Blood Sample

Winterspring Blood Samples drop from the following beasts in Winterspring:
 * Rabid Shardtooth
 * Frostsaber Pride Watcher
 * Frostsaber Huntress
 * Elder Shardtooth
 * Shardtooth Bear
 * Frostsaber
 * Shardtooth Mauler
 * Frostsaber Cub
 * Frostsaber Stalker

As a quest objective

 * An Earnest Proposition