Sangrias Stillblade

Sangrias Stillblade is a Blood Knight sent to test new members of the order in mortal combat. He is summoned by lighting a brazier in a small cave on the Isle of Tribulations.

He bears the same last name of Lonika Stillblade but it's unlikely they are related.

Stillblade is sent by Knight-Lord Bloodvalor to kill the newest initiate (player) as a test into getting into the order. If he succeeds, then you weren't meant to be part of the brotherhood; if he fails, a few initiates are sent to gather his body and place it on the second floor of the Silvermoon City Inn, where he remains dead, until you can revive him.

Trivia
In the languages of Spanish and Portuguese, Sangria means "bleeding". Sangrias Stillblade is also known as Blood Knight Stillblade.