Where do you fight the Astral Colossus?

In the Hollow Sanctum beneath the Astral Highlands.

What is in the boss chest of the Astral Colossus?

A chest with a guaranteed Astral Guardian Core, one Rare Scroll (Bloodsteel or Stormcaller), a 15 percent chance at a Legendary Scroll (Stormward), a 10 percent chance at the Totem of the Lost Friend, a 50 percent chance at its music disc, and Red Crystal Shards, Shattered Core Fragments, Keldite and Astral Dust.

Boss

Astral Colossus

The ancient red-black stone guardian at the heart of the Hollow Sanctum, assembled from floating segments around a glowing core.

monster astral-highlands

Temperament: Boss
Health: 500 (250 hearts)
Attack: 12
Drops: Astral Guardian Core, Rare Scroll

Version: 0.1.0-pre-alpha

The Colossus does not wait in the open. You wake it by filling the Boss Soul Catcher and activating it, and then it rises above you, shoulder segments drifting beside it, the astral core burning in its chest. It is slow and deliberate. Before every attack it settles its aim and direction, and between attacks it pauses, so the fight rewards patience and reading its body.

Its armour is the real obstacle. Bait its charge into one of the arena's pillars and it staggers; bounce its resonance back through the crystals and it cracks. Once its stability is gone, the core opens and you can finally hurt it. Twice in the fight, at 70 and 35 percent health, it seals itself in, and only a Seal Fragment used at the right moment breaks that seal.

Gallery

Astral Colossus in the Hollow Sanctum — In game

Model of the Astral Colossus, sealed 1 — Model

Arena

Hollow Sanctum

Phases

Rewards

A chest with a guaranteed Astral Guardian Core, one Rare Scroll (Bloodsteel or Stormcaller), a 15 percent chance at a Legendary Scroll (Stormward), a 10 percent chance at the Totem of the Lost Friend, a 50 percent chance at its music disc, and Red Crystal Shards, Shattered Core Fragments, Keldite and Astral Dust.
The Colossus itself can drop Rare Scrolls when a player defeats it.
The Colossus Head as a trophy.

Questions about the Astral Colossus

Where do you fight the Astral Colossus?: In the Hollow Sanctum beneath the Astral Highlands.
What is in the boss chest of the Astral Colossus?: A chest with a guaranteed Astral Guardian Core, one Rare Scroll (Bloodsteel or Stormcaller), a 15 percent chance at a Legendary Scroll (Stormward), a 10 percent chance at the Totem of the Lost Friend, a 50 percent chance at its music disc, and Red Crystal Shards, Shattered Core Fragments, Keldite and Astral Dust.

In the guides

Guide 05: Hollow Sanctum