How to Craft the GregStar and GregStar Block

Prerequisites

The GregStar sits above the ATM Star in the progression chain. You need an ATM Star and AllTheCatalystium as inputs, plus the ATM Star Shard line that feeds them. Do not start the GregStar until you have at least one finished ATM Star in hand.

Crafting the GregStar

Combine the ATM Star with AllTheCatalystium in the GregStar recipe. This consumes the ATM Star, so craft a spare first if you also want to keep an ATM Star for other uses. The result is a single GregStar.

Compressing into a GregStar Block

Once you have GregStars, compress them into a GregStar Block for storage. The GregStar Block is a 3x3-style storage block — nine GregStars in, one block out, and the reverse when you need them back. This keeps your inventory clean during long crafting sessions.

Where It Fits

The GregStar chain is the top end of the star progression: ATM Star Shard to ATM Star to GregStar to GregStar Block. The Improbable Probability Device and Pulsating Black Hole sit in the same late-game tier, so expect to gather those materials around the same time.

Tips

• Craft two ATM Stars: one for the GregStar, one to keep.
• Store finished GregStars as a GregStar Block immediately.
• AllTheCatalystium is shared across the star recipes — farm it in bulk.