[3.19] The Orbital Striker Occultist - Hexblast Chaos Ignites leaguestarter to endgame

(from easiest to hardest for this specific build, imo)

Uber shaper:
Bring a 40% reduced damage flask to facetank the bullet hell. The attack is very prone to desync and WILL hit you.
Make sure you have good damage, do NOT witness, and remember that the puddles do not despawn, so keep the arena clean.
Probably the easiest unleashed boss, but still hard.

Uber Cortex:
Complete rng festival, difficulty depends on mods you get.
If you get extra damage, equip an appropriated flagellent elemental mitigation flask that reuses on full. Adapt your pantheon against crit mods. Can be somewhat easy or impossible, rngesus has the weel here.

Uber Maven:
Puddles not despawning means you should not fear tanking the degens to stack them onto another. The crossing rays inflict maven's debuff, which kills any EB build, dodge it at all costs. memory games with map bosses are bullshit, but they are skipped if you die. Last phase isn't really buffed, so overall uber maven isn't much harder, just make sure you know the original fight well.

Uber Uber elder:
Same thing than shaper, but much harder. You need good movementspeed overall, and BRING A SAPPHIRE FLASK. Do not enter elder expanding circles until the very end, shaper will completely cover it. Never stand in the middle of them, always on the edge.

Uber Eater of world:
"Easy" fight if you know it, but almsot impossible to learn. Every aoe has been trippled in size, so even if the boss is not on your screen, you can get hit by an aoe "around him". Avoid aoe and attack/cast speed mods at all costs. Avoid damage mods too, he already hits hard.

Uber Sirus:
Impossible fight without either insane damage or CB + freeze immunity. Make sure you have both, and god sustain to be able to tank ground degens. Stay in melee range of the boss at all time. Last phase is completely unfair since the whole arena is a degen effect, I'm not sure what the design plan was here.
Very hard fight.

Uber Exarch:
Imo the hardest one, it's a huge statcheck that also requires skill. Impossible with inc aoe or extra projectiles mod, beware. Bring a flagellent ruby flask.
For the attack where he shotguns you, run in circles at very melee range around him, you need at least 120% increased movement speed to not die here (so use phase run).
Ball phase is absurd, maybe bring some skeletons, I'm not too sure. Dodgable, but very hard. Argus moves very quickly when enraged (it's a clock, no way to not trigger it), so avoid movementspeed mods, and have a way to hinder (aspect of the spider)