Is Brazen Engines plus Goretrack Onslaught legal?

Yes, and it costs exactly the 3 DP Strike Force budget. Brazen Engines carries the UNIQUE: ONSLAUGHT tag and cannot be taken with another ONSLAUGHT detachment, but Goretrack Onslaught carries no Unique Tag. It only has the word in its name, and a Unique Tag is a printed property rather than a name.

How do you know Goretrack Onslaught has no Unique Tag?

Three independent checks agree. Faction Pack v1.2 does not reprint the detachment but prints no tag for it in its Rules Updates block. Munitorum Field Manual v1.3, which is where Unique Tags are published for detachments the pack does not reprint, lists none, and that reading comes from a parser validated the same day against Astra Militarum, where it correctly finds eleven detachments and four tags, and Grey Knights, where it correctly finds nine and none. Wahapedia's entry for the detachment carries no tag sentence either, while its Brazen Engines entry does.

Are any World Eaters detachment pairings illegal?

No. Brazen Engines is the only World Eaters detachment that carries a Unique Tag, and a Unique Tag only restricts when two detachments share it. Nothing shares ONSLAUGHT, so Detachment Points are the only constraint in this faction, which gives sixteen legal multi-detachment armies at 2,000 points.

Is this pairing actually good, or just legal?

It is genuinely good, because the two halves barely overlap. One buffs DAEMON VEHICLE units and the other buffs units that disembark from a TRANSPORT, so you get two independent threats rather than stacked bonuses on one. Your opponent has to answer daemon engines advancing on one flank and a transport delivering Berzerkers on the other, and killing either does nothing about the other.

World Eaters: Brazen Engines plus Goretrack Onslaught (Why This Legal Pairing Looks Illegal)

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World Eaters: Brazen Engines plus Goretrack Onslaught (Why This Legal Pairing Looks Illegal)

Why this catches good players rather than careless ones

Why the army is actually good

The other shapes this frees up

Common questions

Is Brazen Engines plus Goretrack Onslaught legal?

How do you know Goretrack Onslaught has no Unique Tag?

Are any World Eaters detachment pairings illegal?

Is this pairing actually good, or just legal?