Death & Dismemberment
Description: Math, history, and design of old-school D&D.
Math, history, and design of old-school D&D
Consider the O/AD&D Superhero -- a.k.a, the 8th-level Fighter. If you blink you'll miss it, but in multiple places in early texts it says that fighters of that level can automatically see invisible enemies. (!)
Here's the Fantasy Reference Table from the Chainmail game (included by reference in multiple parts of Original D&D), with key parts highlighted:
Death & Dismemberment