Pierceid

Pierceid has emerged from the darkest corner of Purgatory to support The Inheritor on his claim to the throne of hell. What people seem to be forgetting is that, why would such a powerful and feared creature stand behind someone weaker? Is she planning to wreak havoc from behind the Throne?

Overview
This monster could be obtained in a Breeding Quest. She has two AoE control moves, Possession and CDA (like Sunblast, but much better, since Possession comes with Nightmares and CDA comes with a 3-Turn Death Countdown), good stats, and easily deserves the OP rank. She is also the first non-Warmaster or Nemesis monster to be in the OP rank.

Pros:
 * 5th-fastest Denier in the game
 * Really tanky for a Denier, allowing her to live a hit or two that many others can't.
 * OP trait
 * Excellent skills
 * AoE CDA + 3-turn Death Countdown
 * Amazing Special

Cons:
 * Can't self NER, making her very vulnerable to Torture Effects

Recommended Moveset

 * Possess You With One Go (AoE 35 Dark dmg + Possession + Nightmare, 35s, 3 CD)
 * Sit And Lose (AoE CDA + 3 Turn Death Countdown, 35s, 3 CD)
 * Corruption In Disguise / Out Of My Cage (Disguise for AoE 30 Dark dmg + Curse, 25s, 2 CD) / (Cage for Possession + AoE Reverse Healing, 23s, 2 CD)
 * That's The Inner (Self-True Vision + Single PER + Curse + Block Positive Effects, 20s, 3 CD)

Recommended Runes: 3 Speed

Recommended Allies

 * Neobuki is a great teammate for Pierceid. She is a good ally because she can apply 2 amazing immunities to her allies: Torture Immunity and Control Immunity. This is good because Pierceid is Immune to only one form of control (Possession), but Neobuki’s Control Immunity can make Pierceid immune to 2 more forms of control too. Torture Immunity is also great because it will block Torture Effects that would otherwise chip away at Pierceid's Life, as she does not have a NER skill.
 * Other than those two Monsters, other Monsters that apply Torture Immunity, Control Immunity and/or NER are great allies for Pierceid. Mega Taunt Monsters such as Dunn Ra and Mephisto also work fantastically.

Counters
Pierceid has a combination of AoE Possession and AoE CDA, making it extremely difficult to counter her. It is still possible though.
 * Due to most of her skills being AoE skills, Pierceid gets countered by Mega Taunt Monsters such as Eisul, Dunn Ra, and Mephisto, as well as Monsters with Dodge Area, such as O'Reilly and Helgudin. Wyrmlad is Pierceid's best counter, due to having Dodge Area and being a Light Attacker.
 * NER monsters like Gakora, Yamada, Warmaster Sherezar and Mirak to remove status effects Pierceid inflicts such as DC, Nightmares, and Curse, however, they have to be careful about CDA if they don't have a 0 CD NER skill.
 * Any denier that uses deny tactics besides Possession such as Warmaster Thalassa, Zimnyaya, and Wangzhou. Though Wangzhou has to be wary of Pierceid holding Stamina recovering Relics.
 * Besides the aforementioned Wyrmlad, Light Monsters such as Warmaster Elvira (who has Evasion) and Saika (who is Immune to Possession and can give her Team Control Immunity) can work very well.
 * Also, even though he doesn't deal much damage, Bo Tai is a very good counter for Pierceid. He has a 0 CD CDDA and a 0 CD AoE NER, which takes care of the infamous Sit and Lose. Her other deny skill is an AoE possession and nightmares. He has Possession Immunity and an AoE control immunity for 3 turns. He can also give Nightmare and Bleed immunity to all allies (and deal a good amount of damage with that skill as well). Her reverse healing may be a pain because he has an ally 30% heal and regen but this skill has NER and he has his 0 CD one too. The only potential issue is Stamina as his CDA skill is 60 stamina which is nearly half of his total Stamina, but he does have an ally 30% Stamina and Stamina regen. You can take this instead of his healing skill because he has 2 essence relics or instead of his AoE Nightmare + Bleed immunity if you're not too worried about Nightmares.