The First Traitor
Boss · Cocytus · band C, The Nine Circles

Where The First Traitor waits
The First Traitor holds the gates at depths 21,600, 21,900, 22,200, 22,500, 22,800, 23,100 and onward in Cocytus, sharing the zone's 100-depth gate rhythm with The Frozen General and The Count in the Ice.
What The First Traitor is
The First Traitor is a Wight: it swings an axe, and the body asks for burst damage — it heals as it fights. As a boss it wears the type's defences at 35%, carries no status of its own, and enrages below half health: it hits harder and moves faster.
The First Traitor by the numbers
The card at each gate — health, damage per swing, armour and the modifiers it rolls — straight from the game's spawn table. On the floor the boss leads with 60% of the card's health and 60% of its damage, before the road's own pressure.
What those modifiers do
OF HINDERING- you move 30% slower within 4.5 tiles of it
OF POWER- gains a Power charge on every hit it lands: +200% critical chance each, up to 3
OVERWHELMING- ignores 30 points of your armor
DEADLY- +20% critical strike chance
PIERCING- penetrates 25% of your resistances
BARRIERED- Opens behind a barrier worth 25% of its health
FROSTBOUND- +75% cold resistance (capped at 75%)
RETALIATING- strikes back at once when one blow takes more than 8% of its health and you stand within 2.5 tiles
OF ENDURANCE- gains an Endurance charge every second while hit recently: +15% physical reduction and +15% to the elements each, up to 3
SUNDERING- every blow cuts your armor by 30% for 4 s
OF CHILLING DEATH- leaves a pool of frost where it falls
REGENERATING- Heals 1% of its maximum health every second
VENOMOUS- +35% chance to poison you
VAMPIRIC- heals 1.5% of its maximum health with every blow it lands
ETHEREAL- takes 60% less from HITS, and double from damage over time
BURNING- +35% ignite chance; a quarter of its physical damage becomes fire
OF THE EXECUTIONER- you recover half as much within 4.5 tiles of it
OF FLAMING DEATH- leaves a pool of fire where it falls
Modifiers are rolled per depth and are the same for every player. Bosses always carry at least 3 and never a pace modifier (SWIFT, BRUTE), so a boss's swing rhythm is its own; of the seals only the walls — BLOODLESS, INERT, ASHEN, ETHEREAL, DENSE — ride a boss. The full list is in Enemy modifiers.
At its first gate The First Traitor leads with 5,882,095,819 health, against 4,705,224,099 for the leader one floor above, and swings every 1.25s.
What a gate floor is
A gate is a floor like any other, with the boss leading its last pack. Nothing below it opens until the floor is cleared. A lost floor costs nothing; you can fight it again. How a floor is fought is under Combat.
Fight The First Traitor — play free