Back when he was really dangerous.

Lord de Seis is Undead, and an Oblivion Knight.

Lord de Seis is one the 3 "Seal Bosses" found in the Chaos Sanctuary in Act Four. De Seis is freed by opening the rightmost seal.

Oblivion Knights are one of the most feared monsters in the game due to their ability to cast dangerous curses. Iron Maiden is the most dangerous, a curse that has caused countless melee fighters to kill themselves in just one or two hits. It has no effect on ranged attackers though, so Sorceresses, Bowazons, and other ranged attackers have little difficulty with de Seis or Oblivion Knights in general.

Prior to v1.07 Lord de Seis was much more dangerous, since he spawned with a full boss pack of Oblivion Knights. Since the v1.07 patch he's become much easier, since he now spawns with Doom Knights. His aura was also changed in v1.07, from Decrepify to Fanaticism.

Prior to v1.04, Lord de Seis had the Thief property, an unusual monster modifier that caused potions to drop from a character's belt. That mod was buggy, and was removed from the game in v1.04.

All values are listed by difficulty level: Normal / Nightmare / Hell.

Statistics

Name	Level	Experience	Hit Points	Speed	Max TC/Rune
Lord de Seis	33 / 61 / 88	4315 / 111,790 / 537,545	696-916 / 4593-5742 / 14836-18546	8	36/Sol, 57/Um, 78/Cham

Offense

Lord de Seis is always Extra Strong and Aura Enchanted (Fanaticism currently, Decrepify prior to v1.07.) He gains 1 random modifier on Nightmare and 2 on Hell.

Like all Oblivion Knights, Lord de Seis has no melee attacks, just ranged attacks and curses.

Name

Ranged Attacks

Curses

Lord de Seis

Physical: 27-31 / 57-61 / 97-101
Fire: 33-42 / 69-78 / 121-130
Cold: 31-38 (1.6s) / 67-74 (1.6s) / 119-126 (1.6s)
Poison:

Norm: 46 over 14s (3.3/sec)
Night: 96 over 14s (6.8/sec)
Hell: 167 over 14s (11.9/sec)

Magic (Bone Spirit): 19-24 / 46-51 / 82-87

Level: 3 / 6 / 10
Curses:

Amplify Damage.
Lower Resist
Iron Maiden
Decrepify
Weaken
Life Tap

Defenses

Like many other SuperUniques, Lord de Seis does not regenerate hit points.

Regen Rate tells what % of a monster's hit points are recovered per second. Standard is 1.2/sec.
Blocking tells what % of successful, blockable attacks will not damage the monster. Monsters need not carry a shield to block.
Drain Effectiveness tells what % of a character's mana and life steal apply to that monster. 100 is all, 0 is none.
Chill Effectiveness tells what % of a character's cold length applies to the monster. 100 is all, 0 is no freeze/chill at all.

Name	Defense	Blocking	Regen Rate	Drain Effectiveness	Chill Effectiveness
Lord de Seis	192 / 910 / 1898	--	--	100 / 75 / 33	50 / 40 / 25

Resistances

Resistances over 99% are listed as immunities and monsters will take no damage from that type of attack.
Immunities can be "broken" by skills that lower resistance, if the value drops below 99%. See the Resistances page for more details.

Name	Physical	Fire	Cold	Lightning	Poison	Magic
Lord de Seis	0% / 0% / 33%	60% / 60% / 60%	60% / 80% / 180%	60% / 60% / 60%	60% / 60% / 75%	0% / 0% / 25%

Locations

All SuperUniques (except for Uber Diablo are found in roughly the same location every game, on all three difficulty levels. (Except for the Uber Monsters who are only found on Hell Difficulty.)

Name	Location
Lord de Seis	Act 4: Chaos Sanctuary. (The Seal Boss found in the rightmost corner.)