The Demon Prince is a formidable boss encounter in The Ringed City, serving as the culmination of the Demon's Ruins area. The first phase of this fight pits you against two distinct demons: the Demon in Pain and the Demon from Below. These two demons share a health bar, meaning damage dealt to one affects both. The key to this phase is to focus your attacks on one demon at a time. Typically, it's more advantageous to target the Demon from Below first, as it has a slightly more predictable attack pattern and its demise often leaves the Demon in Pain more vulnerable.
The Demon in Pain is characterized by its fiery attacks and a sweeping charge. The Demon from Below, on the other hand, utilizes a more aggressive, claw-based assault and can also unleash a devastating area-of-effect explosion. Both demons are susceptible to dark damage and bleed. Therefore, weapons infused with dark or those that inflict bleed can significantly shorten this phase. Pay close attention to their tells; the Demon from Below will often rear up before its explosion, and the Demon in Pain will telegraph its charge with a distinct wind-up. Dodging through their attacks is paramount, as their damage output is substantial.
Managing the aggro of both demons is crucial. Try to keep them within a similar proximity to each other, which can help in managing their attacks and positioning. If one demon gets too far ahead in its attack cycle, it can lead to overwhelming pressure. Utilize the environment, such as the pillars, for brief moments of respite, but be aware that the demons can destroy them. Patience and precise dodging are your greatest allies in overcoming this initial onslaught before the true challenge of the Demon Prince emerges.