To get into the Dungeon you need a Temporal Sanctum Key. They drop randomly from enemies but can also be target farmed from Timeline Bosses and the Arena of Champions (Arena not recommended due to low drop rate).

There are many modifiers that the player can encounter from increased chance to find a certain type of Exalted item, to increased crafting materials. Higher tier Dungeons have better versions of the lower tier modifiers as well as new ones (See Difficulty for more info on tiers).

Temporal Sanctum actually has two layouts to every area, both with their own set of enemies. If you so choose, both layouts can be fully cleared by jumping back and forth between both Timelines. You can also use Temporal Shift to traverse the Dungeon more quickly by avoiding obstacles, as well as avoiding enemies in your path (more on this in the Pre Boss Strategy section).

The Temporal Sanctum has several map layouts, all with a somewhat rectangular shape. Each layout has a Divine Era and Ruined Era version that you can switch between with Temporal Shift. The two versions are identical except for where the roadblocks are located.

Speaking of roadblocks, all Dungeons have a system of pseudo randomized roadblocks. These change every Dungeon you run, and their purpose is to block some paths while leaving others open. This is no different in Temporal Sanctum. However, in Temporal Sanctum you can avoid many of the roadblocks by simply switching timelines with Temporal Shift.

While any enemy can be deadly at a high enough difficulty, the normal enemies in Temporal Sanctum are not especially dangerous compared to most enemies in the game. However, there are a few enemies with mechanics that need to be avoided.

Every Dungeon has 4 tiers that you can choose from once they're unlocked. Tier 1 is available by default, and once you complete the Dungeon it unlocks tier 2, etc. Higher tiers have higher level enemies while also adding stronger modifiers. You also need to complete higher tier Dungeons to get certain Uniques from Julra as well as create Legendaries from higher level uniques (see Dungeon Rewards for more info).

Selecting any Dungeon above tier one grants your first modifier. This modifier offers a certain reward, but also increases the difficulty of the Dungeon by adding Increased Damage and Increased Health to all of the enemies (including the boss). You also need to use two doors to progress through the Dungeon (one to go from level one to level 2, and one to go from level 2 to the boss room). Each door also adds a modifier to your run from that point forward, making subsequent rooms more difficult, but also more rewarding, than the previous room.

Lower tier Dungeons have small modifiers, while higher tier Dungeons get substantially more difficult. For example, the strongest modifier at tier 1 adds 30% Increased Health and damage to enemies, while the strongest tier modifier at tier 4 adds 180%. When selecting your modifiers in a Dungeon, don't just pay attention to the rewards it offers, make sure you can also handle the difficulty scaling.

There are no extra attempts in Dungeons. If you die at any point in the Dungeon, you lose all of your progress and need to use a new Key to try again. You need to balance the risks of starting over with the rewards offered to you in order to maximize your Dungeon experience.

Whether you want to clear a map or rush straight to the boss depends on the modifiers you pick up. For example, if you get a modifier that increases the drop rate of Exalted Amulets, it may be worth your time to clear the map. Keep in mind that higher tier Dungeons offer higher drop rates on modifiers. This means that full clearing lower dungeon tiers is unlikely to be rewarding and you're better off pushing to higher tiers and farming there.

If the modifiers aren't enticing enough to farm the Dungeon (and they often won't be) then there is no additional benefit of killing enemies in a Dungeon. Your best strategy, if you can survive it, is to just rush the doors and get to the boss as quickly as possible. Every floor has two doors, if the first door has a modifier that is not desirable or too difficult, you can look for the second door and see if it's better.

The fight is chaotic, with no clear phases or other structured segments, and no clear pattern to many of the skills that she uses. This chaos makes explaining the fight more difficult. We do our best to describe the fight in a logical way, but players should bear in mind that most of Julra's abilities are available to her at any given time, so you have to be prepared for all of them.

After engaging with Julra, expect her to open up with Catastrophic Implosion. You can continue to do damage as the clock winds, but make sure to use Temporal Shift before the clock strikes 12. The Implosion kills most players with appropriate builds for the content, and one shots almost all builds at tier 4, so don't get caught in it! If you happen to get caught and survive, you should immediately cleanse the Doom stacks that were applied to you.

Once you've shifted eras, Julra follows you and immediately casts Dimension Tear under your feet (Note: If you time it correctly, you can use Temporal Shift right before Catastrophic Implosion, then immediately use Temporal Shift to avoid creating a Dimension Tear). It takes a short while for the puddle to form, and follows you until it finishes. Use this time to position the puddle to the edges of the room. As the fight goes on, Julra continues to use Catastrophic Implosion at fairly regular intervals, which forces the player to switch Eras, in turn creating more Dimension Tears. As puddles accumulate they stay in their era, so poor positioning can cause the player to jump directly into a puddle and can also limit room to dodge mechanics. Once the puddle is created, immediately run out (or use a movement skill if you have one).

Throughout the fight, lookout for both Catastrophic Implosion and Unraveling Decay. Handle Catastrophic Implosion the same way you did the first time. For Unraveling Decay you need to stand in the gap between the beams, while also avoiding the other attacks. This can be a particularly tough part of the fight for Melee Leech builds because Julra can stand in her own beams out of reach of the character, preventing Leech, so make sure to save some potions for this part of the fight.

Destroy any Healing Fountains as soon as you can to limit the healing they provide, but don't risk standing in damaging attacks to do so. The healing from this is solid, but not overwhelming to builds with good damage. If Julra uses Summon Pillars while in the Divine Era, kill these as soon as you can. If you're in the Ruined Era, you have to dodge the attacks until you switch eras. You may be tempted to switch eras immediately, but doing so causes Julra to use another Dimension Tear. If you switch eras too often, these begin to pile up and could become overwhelming, so switch eras only when you need to.

The rest of the mechanics are relatively easy to deal with. It's the sheer number of these that Julra can use, overlapped with Unraveling Decay and Dimension Tear that make the fight challenging. Generally the best strategy is to keep moving to naturally dodge some of the mechanics, because over time it becomes hard to see them all and some (Temporal Shot, Lightning Bolt from Summon Pillars) happen quickly, making them difficult to time.

Prioritize the mechanics of the fight over dealing damage. While it can be tempting to try and burn Julra down to avoid too many puddles from Dimension Tear, a poorly placed puddle is far more difficult to deal with than a lot of well placed ones. Properly time your uses of Temporal Shift to avoid Catastrophic Implosion, consistently place the puddles from Dimension Tear, avoid the beams from Unraveling Decay and stay moving to avoid Julra's other attacks to successfully complete this boss, even on tier 4.