The Deathweb spiders are a special breed of spiders living in Deathweb Hollow in Talador. Their venom twists the very form of their victims.
The Shadow Council became privy to this information and dispatched its warlocks to their lair to infuse the spiders with fel energy so that their venom now turned creatures into demonic minions. The draenei Tressia became one of their victim, being transformed into a man'ari eredar before being struck down by her former comrade.
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Taladorantula, Taladorette and Klikixx might be part of the brood due to their locations.