In the original Diablo, there was the main quest and then a small handful of side quests. That's not how it is with the series nowadays. Over the successive Diablo titles, side quests have become a larger and larger part of the game. Diablo Immortal has so many side quests that it's hard to keep track of them all.
Not only does Diablo Immortal have a plethora of side quests, but a sizable number of them are a lot more hidden than others. There are also a ton of side quests that only become available after reaching Paragon status and gaining access to the Hell difficulty setting. On Hell difficulty, side quests can be obtained from Taite in Westmarch. None of the side quests are technically hidden as they are displayed on the mini map in blue; however, some are definitely more awesome than others.
10 The Knowledge Eaters
Located in the Library of Zoltun Kulle, this side quest is started by talking to the Stelliform Sentry standing near some bookcases. What makes this quest so incredible? Well, for starters, it's over very quickly thanks to the events of the quest being located within the same general area. This quest generally gives some decent loot as well.
"The Knowledge Eaters" involves inspecting a bookcase and then defeating the bugs that attack. After that, the player will need to activate the Archive's defenses by interacting with the bundle in front of the same bookcase. Then there are two fights, one involving golems. After this, players need to speak with the Stelliform Sentry again to complete the quest and receive the reward.
9 Night Auction
This is an odd side quest that begins by speaking to a man named Mervain in Bilefen; specifically the northwestern portion of Crimsonblade Haven. Mervain tells the player to stay away from the auction happening nearby, and that there is an odd necklace being sold off.
When the Diablo Immortal player arrives at the auction, the proceedings are interrupted by an attack that they must deal with. During the fray, a group of fetishes steal the necklace and take it back to their hideout; which is to the east of the auction. The player must go into this hideout and destroy the necklace.
8 Break The Curse
This side quest can be found on any of the game's maps, and starts by trying to open a treasure chest. Upon trying to open these chests, the player is attacked by spirits. Defeating these spirits breaks the curse on the chest and allows the player to get to its contents.
Players will want to act as fast as possible when dealing with the attacking spirits. If the player can defeat them fast enough, they will be rewarded with two chests. These spirits aren't too difficult to beat; though they spread out and shoot magical projectiles at the player.
7 Ambush
This is about as hidden as side quests get in Diablo Immortal. There are no warnings that "Ambush" is about to be triggered, and it can happen on every zone in the game. This quest begins when a group of enemies suddenly appear around the player and immediately attack.
The type of enemy is determined by the map the player is on, and these ambush groups will contain elite enemies. The goal is to defeat the enemies attempting to ambush the player. The quest list on the left side of the screen will inform the player which enemies need to be killed to complete the quest.
6 Carnivore's Dilemma
Start this quest by speaking to one of the guards at the south-west entrance to the Sentinel's Watch waypoint in the Mount Zavain zone. This guard (Terell) asks the player if they've seen one of his fellow guards named Ryston. The player must go look for Ryston, but he's actually pretty close to Sentinel's Watch – head west, towards the yellow circle that appears on the mini map.
Ryston will mention that he needs better food than what he's being given, and asks the player to get him some Varanid haunches. Once these are obtained and given to Ryston, he will start a fire with which to cook the haunches. Unfortunately for him, a large Gorejaw Varanid appears and swallows Ryston whole. The player must kill the Gorejaw and return Ryston's Service Badge to Terell to collect the reward.
5 Wanted
Some players might notice a purple skull appear on their mini map from time to time. These are wanted boss creatures. This is classified as a side quest despite it being a random event that can happen in any zone. However, these wanted bosses are always in the same locations within a zone.
These purple glowing bosses are about as difficult as the gold glowing bosses; they always have minions with them as well. In theory, this quest is easy to complete, although picking certain Diablo Immortal classes will make it simpler. All the player has to do is hunt down and defeat this boss to collect the reward.
4 Restless Battle
This side quest can be found in the Ancient Graveyard area of the Frozen Tundra zone. The Ancient Graveyard is not an area traveled by many players. It's a ghost town, both figuratively and literally. Part of the reason is that the creatures in this area have an annoying habit of trapping the player in a ring of ice.
To start this side quest look for a man trying to pull an axe fit for a Barbarian from the permafrost. The axe was trapping an Elder Horror though, which is now free. The player will have to fight some Frost Horrors, then the Elder Horror itself.
3 Scepter Of Desire
"Scepter of Desire" begins in the eastern part of the Windswept Sands in the Shassar Sea zone. The player needs to speak with a man named Gade who asks them to save a group being attack by a local brigand group called the Sand Scorpions. After speaking to a survivor of the raid, the player learns their leader and a man named Zov have taken the remaining hostages to the Chamber of Sacrifice.
The player must hunt down Zov and take the scepter from him. Zov escapes the fight and when pursuing him the player finds the scepter buried in the sand. After giving the scepter to Peth it is discovered that the scepter if a fake.
2 Broken Compass
This is perhaps the most memorable side quest in Diablo Immortal. "Broken Compass" begins by speaking to a man named Roul (near Rhodri's Private Dock) after the player hears him thank another NPC named Talva Silvertongue. Talva is a pirate that is trying to trick Roul with the goal of stealing his shipment of supplies.
Talva escorts Roul away as his pirate cohorts attack the player. The fight continues on a derelict ship as the player makes their way to the top deck and confronts Talva. During this fight Roul is captured. The player finds the victim hanging above a pool of water that happens to be home to a huge creature named Bessie. Players need to kill the pirates and Bessie in order to free Roul and collect a well-earned reward to add to their Diablo Immortal loot.
1 Cleansing The Rot
This is the fourth Diablo Immortal side quest that can happen in any zone and is given to the player at random. At times a blue quest will appear in the quest list prompting the player to destroy a set number of enemies in the immediate area. This will usually include elite or unique boss enemies.
Unless a specific enemy type is given, any enemy will satisfy the quest's requirements. One thing to keep in mind is that if the player leaves the zone before completing this quest it will be failed, but there isn't a time limit the player must work within.
Diablo Immortal is available now for mobile and PC.