I'm sure this will be a surprise to nobody after all the hints I've been dropping - Diabolist is the next profession on our revamp list. The profession will undergo rather substantial changes; the plan with this revamp is to move it away from its current affliction-overload role. Thematically, the profession will become a combination of the current demon-summoning and ritualism, with strong ties to the Rashirmir realm.
The new primary skill of the profession, Ritualism, will focus on the usage of a daegger to sketch various ritualistic symbols. These will have a variety of effects including damage, applying damage resistance modifiers, afflicting, healing, and more. Damage-based strategies are going to become the primary focus of the profession, but in a somewhat different way than other ones do - the focus is more on timed effects and damage resistance modifiers. As always, please note that this may change if testing indicates that this approach does not work reasonably well.
The secondary skill, Nightfall, ties the profession to the Rashirmir realm. Here the Diabolist will learn to summon shadow pseudo-mobs (these are technically mobs, but cannot be attacked/etc) and utilise them for a variety of special effects, designed to augment the Ritualism skill.
Finally, Malignosis remains as the third skill, with many changes. The skill now focuses solely on the Ouroboros - the other demons and daeggers are gone. Most of the existing abilities remain, and new ones are added.
The profession is fully designed and in the process of being coded, with Malignosis and Ritualism already being almost completed. I'll be posting more information on this in the not-too-distant future.