The Cornerstone
Boss · The Unmade · band D, The Foundations

Where The Cornerstone waits
The Cornerstone holds the gates at depths 75,100, 75,700, 76,300, 76,900, 77,500 in The Unmade, sharing the zone's 100-depth gate rhythm with The Unmaker and The First Draft and The Mould-King and The Armature and The Rough Hand.
What The Cornerstone is
The Cornerstone is a Golem: it swings a mace, and the body asks for Overwhelm, the elements instead of physical — and a second wind: a big one breaks into two. 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 Cornerstone 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
DENSE- takes 60% less from damage over TIME, and double from hits
DRAINING- you recover half as much: leech, regen, recoup
OF FLAMING DEATH- leaves a pool of fire where it falls
OVERWHELMING- ignores 30 points of your armor
STORMSHIELDED- +75% lightning resistance (capped at 75%)
BARRIERED- Opens behind a barrier worth 25% of its health
CHILLING- Turns 30% of its physical damage into cold
VAMPIRIC- heals 1.5% of its maximum health with every blow it lands
OF PRECISION- the pack within 4.5 tiles crits 15% more often
SUNDERING- every blow cuts your armor by 30% for 4 s
OF SHOCKING DEATH- leaves a pool of lightning where it falls
SHOCKING- +35% shock chance; a quarter of its physical damage becomes lightning
MANGLING- +35% chance to cause bleeding
PIERCING- penetrates 25% of your resistances
WITHERING- every blow leaves damage over time on you: 15% of the blow each second for 4 s
ETHEREAL- takes 60% less from HITS, and double from damage over time
THICK-SKINNED- Overwhelm and armor you ignore count at half
OF ENDURANCE- gains an Endurance charge every second while hit recently: +15% physical reduction and +15% to the elements each, up to 3
EVASIVE- +22% chance to dodge your hits
ENRAGED- builds 2 Rage with every blow it lands, up to 50; each point is 1% more damage
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 Cornerstone leads with 77,973,765,917 health, against 34,654,051,523 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 Cornerstone — play free