In Phase 3 Season of Discovery, Blizzard has introduced a new Explorer Imp for Warlocks. This pet can be summoned and sent into Fel Portals to obtain various treasured for their Warlock summoners. The full guide also includes Portal locations and treasures that have been found, which you can find below.
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Explorer Imp Overview Guide
To acquire the new spell Explorer Imp, you simply have to use Drain Soul on any enemy monster. Each time a monster is killed with Drain Soul, there is a high chance the Warlock will obtain Explorer's Soul.
The Explorer's Soul item will teach the Warlock Explorer Imp, allowing you to summon the Explorer Imp whenever the Warlock wants to. Warlocks can have both the Explorer Imp and their regular Warlock Pets out at the same time.
While a Warlock has their Explorer Imp summoned, they might come across various Fel Portals in the open world. While near a Fel Portal, the Warlock can speak with their Explorer Imp and send them into the portal. Once inside, the Warlock will gain a buff, Imp on a Mission, which will prevent the Warlock from summoning another Explorer Imp.
After some time has passed and the buff has faded, the Warlock can summon their Explorer Imp again. Once summoned, the Explorer Imp will reward the Warlock with an Otherworldly Treasure, containing various items and sometimes gold.
Fel Sliver in Barrens