Diablo 4 Season 9 Astaroth Boss Battle Strategies: How To Defeat This Returning Boss?
Posted: Jul 07, 2025 Views: 21
Astaroth debuts as a boss in Season 9, but unlike other lair bosses, in order to defeat it, we must complete Escalation Nightmare, which is also a new endgame mechanism added in the new season.
How To Find Astaroth?
In this dungeon connected by 3 Nightmares, we must continue to advance in order to encounter the new Astaroth boss at the end.
Get Sigils
The first step is to get Escalation Nightmare Dungeon Sigil. These new Sigils can only be obtained by completing Horadric Strongrooms.
However, the spawn rate of Horadric Strongrooms is very high, and in addition to Sigil, this is also a great way for you to get all Arcanas and even recipes for making jewels.
After you get some new Sigils, you’ll notice that they have several affixes similar to the ones we find in normal Nightmare Dungeon Sigils, but we also get new affixes, and basically they either make enemies more deadly or make you weaker. So read the description of the Sigil before opening it, choose the one you think is best and go for it.
Run Escalating Nightmares
Season 9 has been really fun so far, and Escalating Nightmares is one of the main reasons why. This activity is very similar to Infernal Hordes, so if you liked Infernal Hordes, you’ll enjoy it too.
The way Escalating Nightmares works is that when you open a dungeon, it has a few affixes that are more challenging than a normal Nightmare Dungeon, and these affixes keep stacking, which is why each new dungeon becomes more challenging.
I think this idea is great, because not only can you get a ton of Diablo 4 gold, gems, materials, and most importantly XP with one dungeon key, but they’re also fun in their own right.
Once you reach Tier 3, the rest is up to your luck, and things can get pretty crazy at times.
Other Tips
Last but not least, here are a few things I think are important to note when running Escalation Nightmare Dungeons:
- Treat these dungeons like you would The Pit, and don’t forget to use Elixirs and Incenses to farm more efficiently.
- Depending on which Torment difficulty level you’re in, you’ll have access to different Tempered gear and quality gems.
- If you die, you can always go back to town to repair, so you don’t have to stress about it, it just costs you some D4 gold.
- Never stop moving, some affixes will cause monsters to constantly spawn, so even checking your inventory or allocating some Paragon points can cause you to die unexpectedly at any time.
- It’s important to upgrade resistances, especially poison resistance. Because, especially at Tier 3, sometimes elite monsters can be very deadly for this reason, and this is also important when dealing with Astaroth boss.
Astaroth Battle Strategies
Once you have successfully cleared 3 dungeons, the final portal will open, which will take you into Astaroth’s Lair.
Once you arrive, you will find him standing on top of Amalgam of Rage, which we know is the first phase of the battle.
Amalgam of Rage will breathe fire from each of his heads at you, while Astaroth can summon meteors and indicate where they will fall in a split second.
If that wasn’t enough, Amalgam of Rage will jump on you to deal fatal damage. The only way to avoid this attack is to teleport as soon as you see it, and to set up some kind of fortification or barrier and maintain it as long as possible.
Once you have done enough damage to Amalgam of Rage, it will begin to regenerate in a pool of blood and venom. Honestly, I think this pool is very similar to the one that Lord Zir can spawn, so basically don’t touch it.
At this point, Astaroth will fight you, and you have one goal, which is to kill Astaroth before Amalgam of Rage regenerates, otherwise you will have to face them both at the same time.
Astaroth will continue to throw meteors at you, as well as some waves of fire that circle around the edge of the arena. So why is it throwing at this specific location, you might ask? This is because as Amalgam of Rage regenerates, the blood pool will continue to expand, and when it reaches its maximum size, there will be nowhere to escape. Combined with Astaroth’s attacks, it’s simply terrifying.
Remember that the poison in the pool has high damage, so the moment you enter the pool, it’s almost game over.
If Amalgam of Rage revives, try to focus your fire on Astaroth, because he has more health than Amalgam of Rage, so you want to drain his health as much as possible. This way, the next time after Amalgam of Rage dies, you can definitely kill Astaroth. Of course, if you want to do it the other way around, it may be possible, but it will definitely take longer.
All in all, defeating Astaroth isn’t that hard compared to other bosses like Andariel or Harbinger of Hatred, but timing is crucial. Regardless, Astaroth is a significant source of boss materials and gear in Season 9, so it’s definitely worth spending some time farming it!
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