So at my job I have plenty of time to think about 40k and the stuff I want to try. During a conversation with a friend of mine we started to brainstorm on the new Tzeentch daemon rules. He is a fan of Tzeentch and was hoping to find a way to make them good.
So we started with a Herald with all the trappings mastery level 3, +1 str to powers. The herald will take the primaris for Tzeentch and Divination. You then stick him in a 19 strong pink horror unit with the blasted standard and the Tzeentch primaris power. We found that the unit was kind of squishy with on T3 and a meager save. The solution is to stick the unit in a bastion. With brotherhood of sorcerers rule only one model needs to cast the power. So even with only one firepoint per side two models can fire out. So the Herald casts prescience to give the whole squad rerolls, then during the shooting phase the unit fires 3d6 times and the Herald fires 2d6 times all at str 6. Finally once per game you can tack on 2d6 str 4 hits from the standard.
To really make the most of the tactic put the bastion a little ways outside of your deployment zone toward the middle of the table. Then move into the bastion turn 1. This really allows you put a lot of fire into anything in the central part of the table. You can also make sure an objective is right behind the bastion for a last turn objective grab.
The bastion and the unit is susceptible to CC but hopefully all the CC that daemons pack in can hold off any threats. Another nice benefit is that you get to allocate wounds from glances/pens so you don't have to worry about a luck hit taking out the Herald. Not a lot of armies can deal with AV 14 at range, especially AV 14 without hull points.
I still have yet to try this out on the table, so I would love to hear from anyone who gives it a try.