Daemonology in 30k: Possession

Analysis. 

Rounding off the discussion on daemonology in 30k is the return of an old favourite that has been present in the game as long ago as Realms of Chaos.

In short: sacrifice the caster and replace her or him with a greater daemon! It is certainly worth the points cost, but probably best to play later in the game, just before the sorcerer or caster has lost their final wound for the match.

As for emanations, don't forget that Lord of Sorcery can be taken for free here, which in turn means potentially more daemons to summon. Or just take wings, or something equally good. Actually, since its a greater daemon that is appearing on the battlefield, there's not too much negative aspects to this power.

The only drawback with this power is if the caster fails their test, in which case it results in an automatic perils of the warp. Even so, this is still a risk worth taking for having a bonus greater daemon join your team on the battlefield.