Spawning
- To spawn in Duskbrood Gate:
- Defeat elementals with tier IV and V spells according to their weakness five times.
- Blue Magic, at least the 8 learned hybrid elemental spells, also works.
- You can also hit the hybrid elementals with either of their weaknesses.
- Perform a 4-step skillchain.
- Defeat elementals with magic bursts five times.
Fighting
- Warps away if any player is KOed before popping or during the fight and if not
 proced for a certain amount of time.
- Extends the time limit by 15 minutes upon defeat.
- Starting at 90% HP, Perfidien changes elemental weakness every 10~15%, marked with a
 animation.
- The color of the cloud represents the element Perfidien is strong to. The element he's weak to is two elements ascendant from the cloud color.
- Will change resistances tiers to 130% for the susceptible element and will then absorb that element's opposite affinity.
- E.g. If
 water is healing Perfidien, then  thunder magic will be it's weakness.
- E.g. If thunder is healing Perfidien, then
 earth magic will be it's weakness, etc.
- Healing Perfidien will cause Encumbrance with duration based on the damage dealt.
- For example, healing for over 7,500 damage will cause over 2 minutes of encumbrance.
- Healing Perfidien enough will cause it to use Vivisection and level up.
- Use low damaging elemental attacks to probe for the weakness.
- Skillchains of multiple elements such as Light or Dark, will inflict the damage Perfidien is absorbing.
 proc and an /emote message appears when first inflicting the weakness. proc appears when dealing ~23,000 damage of the weak element.
- Changes weaknesses 2 minutes after the proc or after depleting a a certain amount of HP, whichever occurs first.
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