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 Fafnir wrote:
Ynnari needs to be cut out and entirely redesigned (or you could just stop at the cutting part). Until they're seriously (and this time, intelligently) rethought to actually work in a way that isn't built around breaking the game, they'll always be a blight on everything they could potentially break the game with.

Ynnari needs its own codex with its own datasheets, this way only the datasheets within the codex can be used, and you can heavily limited the units (0-1 per detachments etc..) and even change point costs to balance Ynnari while still keeping its flavor.
Also it will have its own relics, stratagems, etc...

This is IMO they best route for them.