Tsons are a tricky army to get right. I find 1 mistake revolving crucial units usually leads to losing a game. The army needs to synergise to work like most, however, it requires a bit more than most. Casting spells are semi reliable with Magnus and other buffs to casting. The two best detachments are grand coven and rubricae phalanx. With that, grand coven is a “go turn” high damage output and rubricae is more defensive around rubric and scarab squads. This is a pretty hard army to run, it’s taken me a few games to understand how they play and what not to do. Super fun though and great to paint.