Third Eye of Tzeentch is redundant
DP of Tzeentch, their lore attributes of daemons is that they reroll 1's for their ward save, it can go. While we're talking about your
DP, he shouldn't be Tzeentch anyway it's a non combat lore because you can't cast half the spells in combat, go metal, nurgle or regular death
Your horsemen need to be slaanesh, they WILL fail their frenzy bait and then they are useless because they are not doing what you bought them for, they are stumbling into combat
Combat blocks are good, khorne chariots are good, Gorebeast is good
However, if your chimeras don't have regen they need it, I'd drop the Gorebeast to buy them both flaming breath and regeneration, with the extra points give the skullcrushers a banner and the razor standard, apart form that it looks solid, nice build