A combat summoner that needs to be highly involved in battle as the Crimson Order economy depends on his health being depleted as a resource and then his ability replenishing it. Attacking with Baron Daemar, especially when supported with Sacral Priests, is a big part of how the Crimson Order wins games. Although Faithful Servants can be used to protect him at the end of every turn, the truth is most factions have ways to get through that defense. So positioning Baron Daemar in the right way tactically to get attacks in and at the same time not give good opportunities to the opponent, is a tough and delicate balance. The Baron should be accompanied most of the time by his court of Sacral Priests, as a big part of his power comes from being able to attack for 4-6 ranged strength (beyond the healing he gains).
Because Baron Daemar's life is the core of the faction’s economy, opponents will target him at every opportunity they can. Often it means he can then hit back and gain some of that life back, but still you should be very careful with the Baron’s position at all times. If he loses too much life too easily, the whole economy of the Crimson Order can fall apart quickly.
In a pinch you can retreat and heal by attacking your own units. It’s okay to attack your own Devout Cultist for healing if you have the extra attack, but this is not a great situation to be in.