The Arcanovoid Mount is earnt from the achievement Let em Solo Him: Nullaeus, this achievement requires you to beat Nullaeus on his most difficult version on your own. This is a very difficult encounter and is easier on some classes than others, so if you have geared alts it may be worth trying some of them if you are struggling on the main.
Arcanovoid Construct
The Void's influence is far-reaching and overpowering enough that even an Arcane Guardian can be made to kneel.
How to get the Arcanovoid Construct Mount
Unlock “??” difficulty
Nullaeus is located within the Torment’s Rise delve, to unlock this on the harder difficulty you will first need to complete a tier 10 delve with revives remaining. Our recommendation to do this quickly is to complete the Collegiate Calamity Delve as the NPCs help you a lot. We have a full guide on the Collegiate Calamity Delve.
Locate Torment’s Rise
To fight Nullaeus you first need to find the Torment’s Rise Delve, which is located in The Voidstorm zone, in the South East corner just a little north of Obscurion Citadel.


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Defeat Nullaeus
Nullaeus is a very difficult encounter and may require several attempts. He has several abilities that if you do not deal with them will one shot your character. We recommend you take a look at our full Nullaeus Nemesis Delve Guide for more information on how to deal with this encounter.
Once defeated you will get the achievement Let me Solo Him: Nullaeus, which rewards the Arcanovoid Construct Mount.