Dungeon Master Encyclopaedia

You may have tried to use the following 'cheat':

"Find a dragon and cast a 'MON ZO GOR SAR' spell then press 'ESCAPE' to pause the game. Now whilst holding down the left 'ALT' key type in: 'LORD LIBRASULUS SMITES THEE DOWN' (with spaces). Unpause the game and kill the creature, now when the dragon dies it should leave behind a Firestaff and the party should also be invincible."

Unfortunately, it just pure invention. This was originally published in ST Action magazine (UK) as an April Fools joke written by Nick Clarkson who was the editor of the magazine. Many other magazines and web sites reproduced it without actually checking that it worked. Below are some examples.

Chaos Strikes Back Fake CSB Cheat published in British magazine 'ST Action', Issue #24 April 1990, Page 53

[Supplied by Gambit]

Chaos Strikes Back Fake CSB Cheat published in British magazine 'ST Format', Issue #14 September 1990, Page 72

Chaos Strikes Back for Amiga Fake CSB Cheat published in French magazine 'Joystick', Issue #11 December 1990, Page 186

[Source: Abandonware Magazines]

Chaos Strikes Back Fake CSB Cheat published in British magazine 'ST Format', Issue #23 June 1991, Page 81

Chaos Strikes Back Cheat published in British magazine 'Zero', Issue #23, September 1991, Page 79

Note that in this example, the cheat wasn't even spelled correctly!
[Supplied by Adamo, Source: Amiga Magazine Rack]

Game Player Docs Disks, LSD Docs Disks, Science Docs Disks

http://www.hipooniosamigasite.org/amigadocs/files/GAME-PLAYER-DOCS-DISKS/GAME7/GameCheats.PCM
http://www.hipooniosamigasite.org/amigadocs/files/GAME-PLAYER-DOCS-DISKS/GAME17/PostcardMan-GameCheats
http://www.hipooniosamigasite.org/amigadocs/files/GAME-PLAYER-DOCS-DISKS/GAME19/PostcardMan-GameCheats
http://www.hipooniosamigasite.org/amigadocs/files/GAME-PLAYER-DOCS-DISKS/GAME22/PostcardMan-GameCheats
http://www.hipooniosamigasite.org/amigadocs/files/GAME-PLAYER-DOCS-DISKS/GAME24/PostcardMan-358GameCheats
http://www.hipooniosamigasite.org/amigadocs/files/GAME-PLAYER-DOCS-DISKS/GAME28/PostcardMan-GameCheats
http://www.hipooniosamigasite.org/amigadocs/files/GAME-PLAYER-DOCS-DISKS/GAME31/PostcardMan-GameCheats
http://www.hipooniosamigasite.org/amigadocs/files/GAME-PLAYER-DOCS-DISKS/GAME35/PostcardMan-GameCheats
http://www.hipooniosamigasite.org/amigadocs/files/LSD-DOCS-DISKS/LSD11/Game%20Cheats
http://www.hipooniosamigasite.org/amigadocs/files/LSD-DOCS-DISKS/LSD12/Gaming%20Cheats
http://www.hipooniosamigasite.org/amigadocs/files/LSD-DOCS-DISKS/LSD24/Game.Hints
http://www.hipooniosamigasite.org/amigadocs/files/LSD-DOCS-DISKS/LSD37/AmigaCheats-Update
http://www.hipooniosamigasite.org/amigadocs/files/LSD-DOCS-DISKS/LSD53/SweatCheat.Pt1
http://www.hipooniosamigasite.org/amigadocs/files/LSD-DOCS-DISKS/LSD56/GameSolutions.Pt1
http://www.hipooniosamigasite.org/amigadocs/files/SCIENCE451-DOCS-DISKS/SCIENCE3/GameCHEATS1
http://www.hipooniosamigasite.org/amigadocs/files/SCIENCE451-DOCS-DISKS/SCIENCE6/ChaosStrikesBackCHEAT