Sin of the Abyss, Roentgenium of Nulgath
10m (Nulgath), 1m (Blade)
firstname.lastname@example.org (Nulgath), email@example.com (Blade)
What does this mean? If you had a class that normally dealt 200k damage, attacking Nulgath would lower that to 110k. This is because any damage over the Boss Shield cap (100k in this case) is raised to the shield’s exponent (0.8 in this case), which looks like 100k+100k^0.8=110k. Attacking the Blade would look like 150k+50k^0.7=151947.
The core mechanic of Ultra Nulgath is the three contracts that he applies, including:
Reduces defence by 50% for 10 seconds.
Reduces dodge and crit chance by 75% and outgoing damage by 50% for 10 seconds.
Further reduces dodge and crit chance by 75% and outgoing damage by 50% for 10 seconds.
These contracts apply to the whole party and are conditional, meaning that the second contract (Despair) will apply if the first contract (Frailty) is in effect, and the third contract (Stagnation) will apply if the second is in effect.
Two players should be taunting Nulgath so that these contracts are forced to only apply to them (these players will be referred to as taunter1 and taunter 2 from now on). Taunting should be done with Scrolls of Enrage (see SpellCrafting guide), which is the more flexible option, or with classes like Chaos Avenger that have a built-in taunt. Because the contracts are conditional, you should ideally keep rotating the first contract, stopping anyone from receiving the second one.
Find the two taunting strategies below:
Taunt on cooldown with a 6-second gap between taunter1 and taunter2. For example, taunter1 would enrage at the beginning with taunter2 following 6 seconds in.
This method isn’t flawless, as sometimes the taunts will align so that a player could have either 2 or 3 contracts, leading to their death. Rarely, the party will wipe as well. This method also makes it impossible to use a 3-person party for Ultra Nulgath, which is possible with the Efficient method. This is because enrage is used to catch the first stack of contracts (Frailty), so spamming it is fatal, especially in 3-person comps, because the window of catching Frailty is only 6 seconds, which jeopardises the sync due to conditional contracts getting activated on one taunter or even worse, the rest of the team.
Taunter1 applies Enrage 6 seconds after the team starts attacking Nulgath, and the cue for taunter2 is "Behold the power of the Abyss”, which works because this has a cooldown of 14 seconds, making your enrage accurate and never overlapping with your partner's (existing enrage is overlapped by the latest enrage).
After taunter2 taunts at “Behold the power of the Abyss”, taunter1 should taunt around 10 seconds after that (or 5 seconds after your last frailty faded).
Once this sync is achieved, all the taunters have to do is keep an eye on the cooldown of Frailty to wait for it to wear off so they can reapply enrage right as it fades. I suggest enabling the Aura UI and watching for the skill.
A video with the taunter1 perspective, which shows well-timed taunts using the efficient method, can be found here: https://streamable.com/d7u052.
The other mechanic involves the Overfiend Blade, which will wipe your party if left alive for longer than 45 seconds. However, each time your party does kill the Blade, it gives Ultra Nulgath a buff of 50% more outgoing damage and outgoing physical damage, which stacks indefinitely. Therefore, the Blade should only be killed to avoid the nuke and otherwise left alive.
A safe strategy is to let your DPS party member target it for around 10-20 seconds and then switch to Nulgath, which will kill the Blade around the 36-44 second mark in most good parties. Overall, it should ideally take 0-2 Blade kills before defeating Ultra Nulgath, which can depend on your party, equipment, and consumables. See more info about this in the Setups section below.
A video of a zero-cycle Ultra Nulgath (no Blade kill) can be found here: https://streamable.com/f75x99. It’s also possible to one-shot Ultra Nulgath using a Chrono class, such as CDK or SSoT, with some help from other people.
As long as you have two tanky taunters, you should be fine. These include classes like AP, CAv, VHL or LR. Other options also exist, like LoO (which only works by squaring a Revitalise Elixir - you can do this by consuming a Potent Honour Potion, buffing yourself with all of LoO’s buffs and LR’s 4, then using the Revitalise Elixir, making its HoT larger than usual).
CAv+CAv instead of VHL+VHL works without needing scrolls of enrage but has stricter timing as CAv’s built-in taunt last 4 seconds as opposed to 6 seconds with the scroll.