Sen’jin, a witch doctor and chieftain of the Darkspear Tribe, was in a conflict with a sea witch’s minions when he met Thrall. The conflict’s main goal was to free his people from their fear and servitude to the sea witch. When he and his tribe attempted to flee the isles with the orcish fleet, he was killed by invading humans and murlocs. With his last words, he swore his tribe to follow the leadership of Thrall. His son Vol’Jin now rules the Darkspear Tribe.

Appears in Warcraft III: Reign of Chaos
Appears in Warcraft III: The Frozen Throne(only in online custom games: not all of them though)
Appears in Warcraft III Demo ( Demo also is in Frozen Throne: custom campaign)
He is referenced in World Of Warcraft as Sen’jin Village in Durotar