How would one set up a character to be a daemon summoner, and lead deamons in battle. If at all possible.

1. get a high infamy (around let's see 70 or 75 you can take Daemon engines as minions) also as a Daemon prince regular daemons can be taken as minions (all daemonic army is (as I think) high-end game and Daemon prince level)

2. Intelligence and Willpower is key stats

3. As almost all the forbidden lores (Warp, Daemons, Psykers)

4. Somehow learn the rituals (bind, bond, break, summon greater) and have a lot of ritualist to help out to make a recognizable army

To be honest I rarely think it could work... Daemons is not there to be your tools in mass (they are the goods foot soldiers) but a mixed army counting considerable amounts of daemon engines, possessed heretics and leftover chaos spawns could work...

Also daemons are highly unpredictable and disloyal. For see what gone you do if you have a Tzeench thematic daemon army and your opponent is a Greater Daemon of Tzeench (or works in a way which Tzeench prefer more)?

Minions are the only real way to make it work. The 1d5 corruption for every summoning is just too much havoc on the character's stats to work out otherwise. The horde minion could help encapsulate this.

"Corruption Points can be earned in many different ways and