Abaxoth Spawn chance?

Pit + double Beyond. May take several tries but generally the easiest way to get him.

Spawned for me while running an Incursion (Beyond Caldera map), by the time I realised it was him, the temple timer ran out. Although I did run like a little bitch, as he was hitting like a truck...

You don't find Abaxoth.
Abaxoth finds you.

The absolute best method ive found are on Corrupted 8 Mod high tier maps that hit beyond on one of those 8 rolls.. Also if possible get Sea-Witches as a second roll. Super high quant 120%+ which will equate to nice pack size.. Invest the extra 4 Vaal+Chaos to double up that beyond. From there in my exp the higher tier the better. Ive had the best most consistent luck in crazy rolled vaal temple maps granted of course your build is up to such maps. But if their not up to such maps to begin with even when you do spawn him your not gonna have a good time anyway with him.

Another thing that helps too is try not to use builds that clear screens at a time like Arc for example.. Things like Cyclone or Blade Vortex work much better as you can run into a room full on mobs and pull them all into the same area getting multiple Beyond spawns in the same area helps alot for getting more beyond bosses in general. This is why Sea-Witch Beyond maps are the absolute best hands down for this as well. But yeah stack those spawns and much as possible take your time and pull as many mobs into the same small area as possible to maximize the chance one of those bosses is your man.

And theres no mistaking your got him either even on a build with crazy DPS that insta gibs him... The screen still explodes in blood and shit everywhere. The worst part is the loot though.. All that shit to get him to spawn and having a build that wont get insta rekt by him just to not even see better loot than any of the other beyond bosses.

In my experience he's around about a 1/50 spawn rate. Seems to be approximately
Bameth:70%
Haast: 15%
Tzteosh: 5%
Na'em: 4%
Ephij: 4%
Abaxoth: 2%

Beyond is pretty much a non-issue if you're CI or heavily chaos resistant. Makes it really easy to farm because the spawn is almost always Bameth.

Just got him three times during the same map (Elder influenced Elder Underground Sea T16). Have seen him just once this season before.