Singular Delirium Orb is a stackable currency. It was introduced from PoE 3.10(Delirium League). The price of Singular Delirium Orb is 5x Chaos Orb.
How to use Singular Delirium Orb?
It modifies a Map item adding layers of Delirium with the Unique Items reward type. Right click this item then left click a Map item to apply it. Can apply up to 5 to a single Map item. Shift click to unstack.
Singular Delirium Orb Reward: Unique Items
A unique item is an item with a specific name, unique artwork, and a predetermined list of modifiers. Unique items have the same implicit modifier as a normal item of the same type.
Unique items are meant to be less powerful overall than high-level rare items, but offer unique gameplay and allow special character builds to be based around them.
Currently there are 968 released unique items, including maps and items with modifier variants. For a timeline when each unique item was added, see the timeline of unique items
World drops. Unique items can be found as random drops just the same as any other item. Normal monsters drop items with an item level equal to the monster level, magic monsters drop items with item level at monster level +1, rare/unique monsters drop items with item level at monster level +2.
For example: If a unique item has a base level of 50 that means it can be dropped by normal/magic/rare/unique monsters in level 50+ zones, dropped by magic/rare/unique monsters in level 49 zones, and dropped by Rare/Unique monsters in level 48 zones.
The actual drop rates of unique items are unpublished and can change. The only official public comment regarding drop rates was:
Chris — “[We have] stratified the drop rates of Unique items so that some of them are more common (especially build-enabling ones), and powerful ones are still extremely rare. The drop rates of unique items are no longer proportional to their item type. A common unique ring is now as likely to drop as a common Unique weapon.”
Orb of Chance. There is a very small chance of upgrading a normal item into a unique of the same base type when using an Orb of Chance. For example if you want the Andvarius unique ring then you should use an Orb of Chance on a Gold Ring of normal rarity. Certain uniques are league-specific and will require being on a map with mods from Zana’s map device for this method to work.
Vaal Orb. Certain jewels (click here for a list) and some equipment (like Blood of Corruption) can only be created by corrupting another item. The original item will be lost in the process.
Prophecies. Many prophecies exist that reward uniques, many of them a specific unique item which requires you to hunt down a certain monster and kill it. Others reward you with a random unique, such as The Mysterious Gift, which requires you to trade in five uniques to a vendor.
Vendor recipes. Some unique items can only be produced by using a certain vendor recipe. Orb of Chance does not work, and they can’t be dropped. The item level of the produced unique will be equal to the lowest ilvl of the components of the recipe. See here for a list of such items.
Upgrading. Some unique items can be upgraded to a superior version. See fated items and blessed items for more information.
Divination cards. Sets of divination cards may have a unique item as their reward. These can be drop-restricted items that are otherwise not available.
Event prizes. Occasionally, unique items are offered as top tier prizes in special event competitions. Please note that not all events offer unique items as prizes.