1. Deth-O-Matic 4000 (8D12, Lasergun) - in Periwinkle Titan Mines or purchase with tokens in Endgame

2. Autofire Chaingun (8D12, Firearm) - purchase with tokens in Endgame

3. Super Monster Maul (10D8, Hammer) - in Dark Warren (Raven Wildes)

4. Excalibur (9D8, Lethal, Sword) - in Ancients Level IV

5. Conundrum (6D12, Lethal, Axe) - in Ancients Level IV

6. Phased Plasma Rifle (6D12, Lasergun) - in Periwinkle Cataclysm or purchase with tokens in Endgame

7. Earthbuster (8D8, Hammer) - in 3rd Coil of Bahomet Megalith (usable by Clerics and Bards too)

8. Winged Justice (8D8, Lethal, Crossbow) - end of Skulheim

9. Massacre (5D12, Lethal, Axe) - end of Skulheim

10. All 6D8 weapons: Caliburnus (Sword), Thrice Forged (Sword), Thunderbold (Sword), Crackatoa (Hammer), Elite Corps Pike (Spear), Moon Singer (Spear), Hadesmonger (Lash & Chain)

SWORDS

• Excalibur (9D8, Lethal) - Ancients Level IV
  
• Hellbinder (8D8, Lethal, casts Disintegrate or Cosmic Gate on hit) - in Daemongate (Endgame)
  
• Thrice Forged (6D8, Lethal) - end of Bahomet Spire
  
• Caliburnus (6D8, Lethal) - Samhain Mausoleum
  
• Thunderbolt (6D8, Lethal) - Tabernacle of Music
  
• Widower (5D8, Lethal) - end of Skulheim
  
• Giant Killer (5D8, Lethal) - Nekruel Pyramid Underground (Grendel Fight)
  
• Daguero (6D6, Lethal) - from killing the password seller bandits in Pendulum Hall, Nether Passage, etc.
  
• Flamberge (4D8, Lethal) - Kublai Axis

HAMMER & MACE

• Super Monster Maul (10D8) - Dark Warren (Raven Wildes)
  
• Earthbuster (8D8) - 3rd Coil of Bahomet Megalith (usable by Clerics and Bards too)
  
• Crackatoa (6D8, Lethal, extra fire damage) - Ancients Level IV (usable by Clerics and Bards too)
  
• Minigolf Mallet of Doom (4D12) - Moravia Level VII
  
• Stormbringer (7D6) - Palace Treasure Room (usable by Clerics too)
  
• Skullbuster (6D6) - Samhain Abode of the Horror (usable by Clerics and Bards too)

SPEAR & LANCE

• Elite Corps Pike (6D8, Lethal) - buy from Lt. Shrike in Kublai Axis
  
• Moon Singer (6D8, Lethal) - Samhain Mausoleum (perk item)
  
• Sabre Halberd (5D8, Lethal) - Kublai Axis

AXES

• Conundrum (6D12, Lethal) - Ancients Level IV
  
• Massacre (5D12, Lethal) - end of Skulheim

STAFF & ROD

• Farulosonoth's Staff - Samhain Mausoleum (Perk Item), usable by all magic classes
  
• Apocalypse Stave (casts Armor Rot on hit) - in Dark Warren (Raven Wildes), usable by most magic classes

BLADES

• Stinger (6D6, Lethal) - Saltwyrm Caves
  
• Graveguide (4D6, Lethal) - in Nekruel Pyramid (usable by Necromancers too)

LASH & CHAIN

• Hadesmonger (6D8) - in Oblivion (Endgame) or by having Ahriman send you there earlier
  
• Toxibarb (5D8) - in Nether Passage (combination lock chest)
  
• Scourge (6D6) - in Dark Warren (Raven Wildes)

HAND-TO-HAND

• Doom Fists (6D6) - Dark Warren (Raven Wildes)
  
• Battle Gauntlet (3D8) - Kroondegraf's Hollow

ARCHERY

• Winged Justice (8D8, Lethal, Crossbow) - end of Skulheim
  
• Legend Maker (6D6, Lethal, Crossbow) - Refuge of the Ancients
  
• Nevermiss (6D6, Sling) - Grand Refuge of the Ancients (usable by Wizards, Clerics and Sages too)

FIREARMS

• Deth-O-Matic 4000 (8D12) - in Periwinkle Titan Mines or purchase with tokens in Endgame
  
• Autofire Chaingun (8D12) - purchase with tokens in Endgame
  
• Phased Plasma Rifle (6D12) - in Periwinkle Cataclysm or purchase with tokens in Endgame
  
• Star Gauntlet (6D6) - start at the Sanctuary or purchase with tokens in Endgame

(Note: Firearms Skill needs to be obtained by starting at the Sanctuary or late in the Endgame)

Originally published by me at the Grimoire Wiki:
http://grimoire.wiki/index.php/Items#List_of_the_best_weapons