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===Diablo===
''This section added by [[User:Flux|Flux]] when posting this guide: February 2009.''
[[Image:D1-mon-diablo.gif|frame]]
[[D1 Diablo|Diablo]] is found in a closed square on the lower left quarter of level 16. In the box with Diablo are at least 8 mages and 10 knights, though others (randomly spawned) are usually found in there as well. More so than any other monster, Diablo should be fought solo; he's hard enough without knights joining in, or Advocates launching fireballs. The easiest way to lure out Diablo is with a trick; use Holy Bolt. Diablo is a Demon, but he's also vulnerable to Holy Bolt; the only Demon in the game who is. This isn't a tactic to kill him; it's just a trick to "wake up" Diablo without disturbing any of the knights or mages. If your aim is true (watch the map, aim right down the center of the room, and shoot in a straight line), Diablo will grunt in pain and come charging out to fight.
A more aggressive way to bring him out is to simply run up and let him see you. This isn't especially advised through, since the knights will all pour forth as well. It's possible to visually nibble your way in, moving just close enough for the knights (and mages) on one side to see you, then backing off around the corner to kill them. It can also be fun to cast fire spells into the room; guardian or fire wall are amusing, but Flame Wave is the best, since it will sweep through the entire square and hit everything not behind one of the corner walls. Note that Advocates are fire immune on Hell, and will not react to flame attacks.
Diablo has by far the highest hit points, AC, and damage in the game (and they're raised still further on Hellfire), so prepare for a long fight. (His full stats are listed on [[D1 Diablo|his monster page]].) As with any tough fight, it's wise to stock up on potions in advance, and to make sure your equipment is fully-repaired. Drop extra potions on the ground if you think you'll need them, since it's faster to pick them up than try to click and drag them from your inventory to your belt mid-fight. The key to beating Diablo is the same as with most tough melee bosses; make sure you've got plenty of to/hit and a fast swing. Hitting him with your swings is more important than doing a bit more damage, so if you must choose damage vs. to/hit, take the to/hit. Being able to block his attacks (both his melee and his Apocalypse spell can be blocked) helps, as does doing sufficient damage to rock him.
Apocalypse is auto-targeting, but it takes a fraction of a second to appear after it's cast. This makes it possible to dodge the spell, if you change direction constantly. Walk in a zig zag while leading Diablo to the spot you wish to fight him in; walking in a straight line will let his every Apocalypse hit.
Diablo uses the same AI as the Magma Demons. His spell is Apocalypse, not throwing a molten rock, but he moves around the same way, dancing side to side and circling the target. This AI is very evident if you use a weapon with knock back, since every time you push Diablo more than a step away he'll run back and start circling again, while periodically pausing to cast Apocalypse.
Positioning is important against Diablo, since he has a knock back hit. If you want to go toe to toe, put yourself against a wall or in a corner, and make sure he's hitting you back against the wall. Your character will not be knocked back and can keep whacking away non-stop. You can use his knockback to your advantage if you're lower on AC, hit points, or lack good blocking. In that case make sure there is '''not''' a wall behind you. This way Diablo will never hit you twice in a row, since his hits will knock you backwards. Keep swinging, you'll be able to get in a free hit or two every time you are pushed back, when he has to move forward to get back into melee range.
An oddity of this style of fight is that your character will be steadily pushed back out of their light radius. There's a bug in Diablo in which a character's or monsters's light radius only readjusts if the character actually moves. If you stand still and get knocked back by attacks, your light radius will remain where you last moved, until you move again when it will jump back to display properly. This can be observed when using a bow with knock back against a boss, or (more painfully) when Diablo beats your character halfway across a level.
Since the game ends when you kill Diablo, it's wise to prepare in advance. Be sure you've picked up everything you left in town and done your final shopping and repairs. If you want to do a full clear of 16, you'll need to lure Diablo away and then return to clear out his box. In multiplayer, this is easily done by exploiting the fact that characters do not drop their equipment when they die on level 16. Simply cast a town portal somewhere out of sight near Diablo's box, wake Diablo up, and lead him to the other side of the level. Let him kill you there, restart in town, and take your portal back down. If your character has teleport ditching Diablo is even easier; just lead him around to the right side of the level and teleport over a wall. Be sure you're far enough from the opening in the center of the level that he can't pathfind his way around after you.
{{diablo items}}
{{Diablo monsters}}
[[category: Diablo I]]
[[category: D1 Strategy]]