Fifteen is for the Troll’s Hoard in Trollstone Caverns. TC is the short GM adventure that I wrote for 5th edition T & T. While much of the text in 5th edition actually came from Liz Danforth, the Trollstone Caverns is all mine. The map has 18 key locations, but location 15 is the deepest point, and the spot where any adventurers are most likely to get good loot.
Fifteen is a number widely used in the weapons tables of the 5th edition. Medium self bows and medium longbows both require a DEX of 15 to use them. I took 2 semesters of archery a million years ago when I was in college. It’s harder than it looks. Really light bows don’t have much penetrating power. Heavier weapons that take more strength to draw tend to wobble. Modern bowmen all want to be sharpshooters–too much of the Robin Hood legend, I think. Ancient and medieveal bowmen didn’t worry so much about shooting straight. They were grouped in companies, and they laid down barrages of arrow fire by making high arcing shots. The bow was the artillery of its time.
15 is also the number of weapon adds that all the early forms of pistols get in combat. If your character gets shot with a gunne in T & T, he/she is gonna get hurt, and hurt pretty bad.
There is one 15th level spell in 5th edition T & T. Air, Earth, Fire, and Water allows the caster to conjure an elemental to use as a servant for 5 game turns. Its monster rating will equal the total of the caster’s attributes times two. That will usually generate a humongously powerful servant. 300 years later in 7th edition T & T, this spell has been lost.
If you can think of any other fine fifteens used in Tunnels and Trolls, please list them in the comments below, and come back tomorrow to see what I can do with sweet Sixteen.