Terror Essence is a new item in Diablo Immortal, and it can be used to start Oblivion Pillars and Hellslayer Bounties.
Diablo Immortal recently received a major update, and it introduced numerous new features that you can enjoy.
The update introduced Terror Rifts, Terror Essence, Oblivion Pillars, Hellslayer Bounties, Eternal Equipment and new Legendary Gems.
Terror Essence is a new item that is used to enjoy Oblivion Pillars and Hellslayer Bounties. Players can farm the Essence by collecting Stygian Fragments and then sacrificing the Fragments to summon a powerful boss.
After defeating the boss, you will be able to claim a reward chest, which generally contains Terror Essence.
However, if you are not interested in farming Terror Essence, you can purchase Terror Essence at Wynton’s Grand Market. If you have too much Terror Essence, you can also sell your Essence at the same market.

Once you have acquired Terror Essence, you can use it to locate an Oblivion Pillar, which is a new activity in Diablo Immortal.
Oblivion Pillars require that players defeat waves of native supercharged monsters or treasure goblins within a specific amount of time. When the timer runs out, the activity will end, whether you have completed it or not.
If you manage to survive the waves of demons, there is a chance that you will receive Eternal Equipment.
Oblivion Pillars
Players who cannot purchase Terror Essence will have to complete Oblivion Pillars to obtain the new resource. It is worth noting that you have to play in Inferno Difficulty I or higher to activate an Oblivion Pillar.
These new Pillars can be found where Terror Rifts spawn in every zone and can be accessed at any time. You can use your Terror Essence to locate an Oblivion Pillar and activate it.
After activating it, you have to survive multiple waves of enemies to get a chance to earn Eternal Equipment.

Hellslayer Bounties
Players enjoying Inferno Difficulty I and above and combine their 4 normal, active Bounties into a Hellslayer Bounty at the Bounty Board for the coast of 1 Terror Essence.
This means that Hellslayer Bounties are 4 times more valuable than a typical bounty, but this does not come without risk.
After obtaining a Hellslayer Bounty, you can travel to the zone listed on your Bounty and locate the Hellslayer Bounties Portal.
Diablo Immortal players will then have to take their stand against vicious hordes in a more forgiving style of Oblivion Pillars gameplay.
Hellslayer Bounties are a great way for you to use your Terror Essence while also potentially obtaining Eternal Equipment.
Eternal Equipment
As mentioned, you have a great chance of earning Eternal Equipment if you use your Terror Essence.
It is worth noting that Eternal Equipment only drops from Terror Rifts, Oblivion Pillars and Hellslayer Bounties.
These equipment pieces contain 3 Attributes and 4 Magic Attributes, 2 of which are from the existing pool of Affixes, while the other 2 are from a new pool of class-specific Affixes.