Legendary Potential (LP) appears exclusively on unique items. LP determines whether a unique can become a Legendary-and more importantly, how many affixes it can inherit from an exalted item. A unique item can naturally roll anywhere from 0 to 4 Legendary Potential. Higher-level content increases the chances of Last Epoch gold finding uniques with LP, and once Empowered Monoliths become accessible, these items drop at significantly higher rates.

The number of LP on the unique directly determines how many affixes it will gain from the exalted item during the merging process. For example, a unique with 2 LP can receive two random affixes, while a 4 LP unique can receive all four available affixes from a qualifying exalted base.

Preparing the Items: Unique + Exalted

Before entering the dungeon where Legendary items are forged, two components must be in hand:

1. A Unique Item With Legendary Potential

This will serve as the base. Any unique can have LP, but the higher the content difficulty, the more frequently items will drop with 1–4 LP.

2. An Exalted Item With the Same Base Type

This is crucial. Item types must match exactly. A unique wand requires an exalted wand, a unique chest piece requires an exalted chest piece, and so on.

The exalted item must also have four total affixes, consisting of two prefixes and two suffixes. Even if an affix has been removed via a Glyph of Despair, the item is still valid as long as it maintains the proper affix structure. If a promising exalted item drops with missing affixes, the Forge can be used to craft it into the required state.

Once both items are ready, the next step is reaching the one location where Legendary items can be created: the Temporal Sanctum.

Navigating the Temporal Sanctum

The Temporal Sanctum dungeon is the heart of Legendary item crafting. Before entering, a Temporal Sanctum Key is required. Once inside, the dungeon introduces a unique mechanic: timeline swapping. Pressing the D key switches the dungeon between two versions of the map, often revealing new paths or bypassing hazards.

Dungeon Layout and Progression

The Temporal Sanctum consists of cheap Last Epoch gold multiple floors. While layouts can vary, paths tend to lead upward or north, making those the best initial directions when navigating.