The Awakening Elixir

You are a human adventurer with distant ancestry from another race. During a solo expedition, you were gravely wounded in combat. Barely clinging to life, you managed to crawl to safety and drink a powerful healing potion. However, the potion reacted unexpectedly, recognizing the ancient bloodline within you. Due to the severity of your injuries and the strength of the magic, the potion didn't just heal you, it awakened or altered part of your ancestral heritage, granting you a new trait or characteristic from that lineage.