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[[Diablo ]] is found in the [[Chaos Sanctuary]], and you must release him by opening the seals you find around the level. There are five seals in three locations. Three of the Seals will spawn a fearsome pack of boss monsters, and opening all five and killing all of the three seal bosses will make Diablo appear in the center of the pentagram of fire in the middle of the level.

The Chaos Sanctuary is among the most difficulty area in the game for most character types, much worse than anything you see in Act Five even. You must have very good Characters will want high resistances here, and it's especially dangerous for melee characters due to the Obsidian [[Oblivion Knights ]] casting Iron Maiden, which a curse that will often cause a an afflicted melee char character to kill themselves with their next attack or two in most cases.

There is no reward for this quest other than what Diablo drops. He can drop very good stuff , thoughas an act boss, and his loot is usually kicks out 4 or 6 items in v1.08. In party games you'll want to be quick to grab anything he dropssubstantial.

'''Tips:''' The Seals that release the Seal Bosses are always the same, depending on the layout of the level. De [[Lord de Seis ]] always has one seal, so no wondering there. He used to appear right on top of it some times, but in the Expansion he's always over far to the left, in the hallway coming towards his Seal. The [[Grand Vizier of Chaos]] is always to the left, -- if there is a single hallway with a corner there, the first Seal you reach will always release him. If there is a fork there, the Seal to the right will release him. For the [[Infector of Souls]], if there is a single hallway with a Seal in the middle, and then a pair of right turns into a Cul de Sac, it's always the Seal in the back corner. If there is a shorter straight hallway with Seals on both sides, it's always the first Seal you reach. Knowing which Seal is going to release them is useful to get ready for their appearance.

[[Diablo ]] is the hardest boss a difficult fight for many characters. He dies more quickly than [[Baal]], but can deal far more damage while he remains alive. Diablo was much more dangerous prior to kill in the gameexpansion, since his Firestorm ground flame attack could hit nearby targets many, many times, harder than Baal potentially killing almost any character in the Expansiona blink. His Pink Lightning (often referred to as pink lighting was very hazardous too, dangerous enough that D2 players dubbed it the LBoD , for "Lightning Bolt of Death.") is the most damaging attack It too has been much nerfed in the game, dealing 50% Lightning Expansion (v1.07 and later) and 50% Physical damageis no longer lethal. You can resist the Lightning and Block the physicalIt doesn't even hit characters at melee range, but it does huge damage anyway. All can hurt ranged attackers quite a bit, and most players quickly learn to run from it and in circles around Diablo, so when he's spinning fires this inferno-like spell and trailing you with the LBoDtracks it after his target.

His LBoD is toned down in v1.08, doing a lot less instant damage, but his Fire ground attack is much improved. Diablo also has a very high blocking rate, which makes him last a lot longer than you expect, and makes him seem almost impossible to hit at times. This is especially noticeable for ranged attackers, as arrow after arrow hits him and vanishes, with no damage being done.

Using Minions on him is very hard also, as he does seven times damage to minions, and any of his Fire or Lightning spells will usually kill every minion on the screen in an instant. He has a melee freezing hit also, and a charging slap attack, but it's the elemental attacks that most find so dangerous. He isn't immune to anything though, so any type of attack can kill him, eventually.