If you've got a Disease on one of your prized Commanders or Mages and nobody to heal it for you, fret not! Cure Disease will fix that right up!

It's a Level 4 Thaumaturgy Ritual that requires 4 to cast, and that consumes 5 on use. It's not very efficient, but it's an emergency option.

What are some other options? Well:

• Disease Healers can fix it, of course. True Healers can do it too.
• If you don't have a Disease Healer, you can have a 5 Mage make one by crafting a Miraculous Cure All Elixir for 40. (req. Const 4)
• Alternatively, you can have a 5 Mage summon a Disease-Healing Faery Queen for only 20. (req. Conj 8)
• Gift of Health will cure it eventually, if you have a 6 Mage and at least 50 lying around. (req. Ench 7)
• If all you're worried about is their death, then any Regeneration Item will prevent that by allowing healing. (req. 2 & Const 4 at least)
• If you don't have even 2, a 1 Mage (Ench 1), 11 Mage (Evo 3), or 3 Mage (Ench 4) can restore HP in battle.
• If your Diseased guy is a 2 Mage, then they can use Twiceborn to ignore the Disease while they're Undead. (req. Ench 4)
• Otherwise, try to get their name in the history books for the Ritual of Rebirth, if you have a 4 mage. (req. Ench 7)

The severity of Disease varies from guy to guy. If it's on your Pretender, then you're more worried about the other Afflictions it can cause. If it's on someone else, then you probably shouldn't care TOO much, unless your guy has a very-rare Magic spread (such as a 10% random) or something else.