New races: Four new character races for Advanced Fantasy games. The dragonborn, the mutoid, the mycelian, and the tiefling.

Expanded adventuring gear: 40 new adventuring gear items to increase adventuring options and character customization.

Expanded armor and weapons: 7 new weapons and 5 new types of armor, inspired by types available in the 1970s Advanced 1st Edition rules and the 1984 Companion rules.

Woodland monsters: 8 brand new monsters that lurk in the deep, shadowed glades and sacred groves of ancient forests beyond civilized lands.

Monster creation guidelines: Referee guidelines for creating new monsters for Old-School Essentials games. Keep the game fresh (and players on their toes) by devising your own new horrors and foes.