Can Cities of Sigmar Living City take a Sylvaneth Battalion without it being an ally?

[BaylorCorvette]

1 in 4 units in Living City can be Sylvaneth. Could you take the "Outcasts" battalion (3 units of Spite-Revenants) provided that you have at least 12 units in your list, so that you can have 3 Sylvaneth units. Or would this automatically make them allies?

[Beliman]

There is a FAQ that talks about that:

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An army can include a warscroll battalion of a different allegiance to the rest of the army, but if it does so the units in it do count against the limits on the number of allies the army can have (and the points for the battalion and the units in it count against the points limit that can be spent on allies in a Pitched Battle).

The issue here is that Living City doens't have Sylvaneth as allies:

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Daughters of Khaine, Fyreslayers, Idoneth Deepking, Kharadron Overlords (except in Tempest's Eye army), Sylvaneth (except in a Living City army or a Greywater Fastness army).

Imho, you can't use any Sylvaneth battalion for Living City because they can't be allied units. But, as you said, Living City can use 1/4 units of Sylvaneth as part of their army.

[Doko]

I think battallions are only for his tome.

So you only can get sylvaneth battallion in sylvaneth army.

Living city can get only city of sigmar battallions

[JackStreicher]

Iirc you have to ally the battalion and all the units in it count as allied as well. So you can't combine Living City Sylvaneth with actual Sylvaneth battalions

[Lord Krungharr]

I think the Battalion itself also has a keyword doesn't it?  There was some issues with that when the Beasts of Chaos got those Chaos god keywords but the battalions couldn't initially be included in a Khorne army for example with Brass Despoilers.