Does Subspace ASC Center have a 4-piece bonus?

No. Subspace ASC Center is a Planar Ornament set: it has two pieces, a Planar Sphere and a Link Rope, and the 2-piece bonus is the whole set.

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Planar SphereASC Dark Fissure

Subspace ASC Center

Planar Ornament set · Honkai: Star Rail

2★ · 3★ · 4★ · 5★

Set bonuses

One tier

2-piece

Increases the wearer's SPD by 6%. When the wearer's SPD reaches 145 or higher, increases all allies' Break Effect by 18% after entering combat. This effect cannot stack.

A Planar Ornament set is two pieces (the Planar Sphere and the Link Rope), so the 2-piece bonus is the whole set. There is no 4-piece tier to reach.

Pieces

2 slots

Planar Sphere
ASC Dark Fissure
Link Rope
ASC Negative Film

Subspace ASC Center FAQ

What is the Subspace ASC Center 2-piece bonus?: Increases the wearer's SPD by 6%. When the wearer's SPD reaches 145 or higher, increases all allies' Break Effect by 18% after entering combat. This effect cannot stack.
Does Subspace ASC Center have a 4-piece bonus?: No. Subspace ASC Center is a Planar Ornament set: it has two pieces, a Planar Sphere and a Link Rope, and the 2-piece bonus is the whole set.

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