From the publisher's blurb:
There are no stars in the sky.
The world’s civilization has collapsed into tiny pockets of societies separated by wilderness overcome with decay and corruption. But in this darkness, there is hope.
Highcaster is a game about creating legends. It is the story of a civilization rising from the ashes, reaching out into the vast unknown to create a new world and destroy the decay and corruption that threatens it. Featuring the unique Caster system, Highcaster helps you create long-lasting tales of legend, courage, and hope.
The System
The Caster System uses a d20 as its core randomizer that must meet or exceed a target number to achieve a spectrum of success, but includes a pool of dice built based upon their stats, talents, or disciplines to serve as modifier. The highest result from the dice pool is added to the d20 result.
Players are rolling against "threats," which may occur in multiple stages and with each success or failure, cause the story to change. Their stats and moves are based in their motivation, not necessarily in their ability, so the mechanics focus more on the story rather than beat-by-beat tactical action.
Additionally, players are given levers with which they can control the narrative, creating a collaborative experience at the table and a highly emergent story. Character advancement is simple, but expansive and can yield very long-term campaign play.