Use a treasure trade-out system similar to that presented in Swords & Wizardry.
These chances stack/overlap. Take a treasure worth 5,000 gp, for example. It gives a 10% chance to roll on the 5,000 gp table and five 10% chances to roll on the 1,000 gp table and fifty 10% chances to roll on the 100 gp table.
For large treasures, rather than rolling many times for magic items, we can use the expected value of a binomial random variable — i.e., the probability (10%) times the number of rolls.
How may minor magic items might be in a 2,000 gp treasure? 2000 ÷ 100 = 20, so we expect a 2,000 gp treasure to yield two minor magic items.
>>> (2000/100) * .1 2.0
Take an 18,500 gp treasure as another example. That yields nineteen minor items, two medium items, and 16,400 gp of non-magical treasure.
>>> (18500 / 100) * .1 18.5 >>> (18500 / 100) * .1 18.5 >>> (18500 / 1000) * .1 1.8 >>> (18500 / 5000) * .1 0.30000000000000004 >>> 18500 - (19 * 100) - (2 * 100) 16400
The following Labyrinth Lord potions originated in the 1974 rules.
|24–27||Fire Resistance||76–79||Plant Control|
|40–43||Giant Strength||91–96||Treasure Finding|
The following Labyrinth Lord miscellaneous magic items originated in the 1974 rules.
|d100||Misc. Magic Item|
|01–03||Amulet vs. Crystal Balls and ESP|
|04–08||Bag of Holding|
|09–13||Boots of Levitation|
|14–18||Boots of Speed|
|19–23||Boots of Traveling and Leaping|
|24||Bowl Commanding Water Elementals|
|25||Brazier Commanding Fire Elementals|
|26–30||Broom of Flying|
|31||Censer Controlling Air Elementals|
|36–37||Crystal Ball with Clairaudience|
|38||Crystal Ball with ESP|
|42||Drums of Panic|
|45–53||Elven Cloak and Boots|
|55–61||Gauntlets of Ogre Power|
|62–63||Girdle of Giant Strength|
|64–74||Helm of Alignment Changing|
|75–79||Helm of Comprehend Languages and Reading Magic|
|80–82||Helm of Telepathy|
|83||Helm of Teleportation|
|84||Horn of Blasting|
|85–89||Medallion of Thoughts|
|90–92||Medallion of Thoughts (9′)|
|93||Mirror of Life Trapping|
|94–99||Scarab of Protection from Evil High Priests|
|100||Stone Controlling Earth Elementals|