Xeleth can be found in Zangarmarsh. [16, 39.7] He only appears after someone plants the Imbued Silver Spear into the Portal Clearing in western Zangarmarsh. This is done as the objective for the quest  , part of the Scryers/Aldor chain quest that starts in Shadowmoon Valley with  .
Xeleth was once worshipped as a god by primitive swamp creatures in Zangarmarsh. When Draenor was nearly destroyed, he retreated into a slumber deep beneath Marshlight Lake. He wears a scar made by the Imbued Silver Spear, caused by the demon hunter Altruis the Sufferer.
- Who disturbs my slumber? That spear... I still carry the scar!