This sub is dedicated to the world's oldest and most popular pen&paper role-playing game, Dungeons & Dragons.
All editions of the game welcome, including clones and variants like Pathfinder, Lamentations of the Flaming Princess, True20, OSRIC, Microlite20 etc.
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The basic idea is as following: There is a hard cap of level 6, and every 5,000XP afterwards a new Feat is gained. That keeps the game in a spot where level 3 spells are the best spells known to any PC, just the spell level where Tier 1 casters meet an equilibrium with mundane classes and before "Get out of jail free" spells like Freedom of Movement come online.
For the creators of E6, that is the sweet spot where PCs are heroic and the classes are relatively balanced, and they are kept there for the remainder of the campaign. That obviously brings some implied changes with it for the campaign setting (for example, CR10 monsters like Brass Golems or Couatls would be the absolute top tier of monsters that players can expect to be able beat, and there would be no lvl20+ NPCs like Elminster hanging around to casually beat back planar threats), but that might work better for some settings like Titan, Ravenloft or Hyboria.