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Yes. Each faction lists which other factions can be taken as allies. For the Slaves to Darkness, that includes Hedonites of Slaanesh. 25.8 ALLIES Below a faction’s Pitched Battle profiles table, you will find a list of allies that can be taken in an army from that faction (see 27.1). The allies list will detail which factions you can take allied units from ...


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The "General's Handbook" Page 9, pitched battles table 1, states that armies in 1000 point battles are limited to 0-200 points in allied units, while in 2000 point battles, the limit is 0-400 points for allied units. That must be the origin of the 20% idea. As for the second statement, the (August 2021) Errata on the Hedonites of Slaanesh 2 has the ...


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