Infector of Souls
From Diablo Wiki
The Infector of Souls is a Unique Venom Lord found in the Chaos Sanctuary in Act IV of Diablo II.
He is released by opening the seals in the lower right corner of the level, and must be killed in order to reach Diablo and finish the Terror's End quest. This quest ends the game in Diablo II, and enables a character to advance to Act V in the Expansion.
The Infector of Souls is considered very dangerous for two reasons: his blinding speed and his spawn location. After opening the seal players only have a few seconds to move back to the main room before the Infector spawns; because the seal is situated in a corner, there usually isn't enough time. The Infector and his minions can swarm players in mere seconds and due to their fire and melee attacks players often suffer quick deaths.
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