He appeared before Augustus, Blood and Mary after the events of the High King's sealing. He offered them a contract to become undead and in exchange he would wipe out the horde of demons overrunning the city in which the High King was sealed away. They would become the protectors of the High King's Seal until they lose their attachment and Stagnate will claim their souls.
Powers and Stats
Tier: At least 8-B, likely higher
Name: Stagenate's Echo
Origin: The Faraway Paladin
Classification: Stagenate's Echo, God
Powers and Abilities: Superhuman Physical Characteristics, Creation and Reality Warping (With "Words of Creation"), Telepathy (Read Will's mind), Summoning (Can summon a horde of 100 undead warriors and magicians), Soul Manipulation (Attempted to take Mary's, Gus's and Blood's souls after they broke their contract ), Death Manipulation and Power Bestowal (Can grant Immortality Type 1 and 5 to others), Invulnerability (An Echo can only be hurt by strong magic or demon blades), Body Control and Poison Manipulation (Turned his severed arm into a poisonous snake), Explosion Manipulation (With "Vastare"), Immortality (Type 4; If killed, the Echo's soul will go back to the cycle of reincarnation and will be sent to another world), Resistance to Soul Manipulation and BFR (Resisted Will's Divine Flame, which is capable of sending one's soul back to the cycle of reincarnation)
Attack Potency: At least City Block level, likely higher (Stronger than Mary, Gus and Blood who fought against the High King, can create powerful explosions with "Vastare")
Lifting Strength: Unknown
Striking Strength: At least City Block class, likely higher
Range: Extended Melee range, Tens of meters with "Words of Creation"
Standard Equipment: None notable
Weaknesses: None notable