100% of proceeds go to Doctors Without Borders, and you can grab the bundle, for a limited time, from DriveThruRPG.
Set late Age of the Antonines (AD 145), at the peak of the Roman Empire when ancient wizards fought to defeat death and explorers brought back dangerous artefacts from the remains of alien civilisations, only a few fight to hold back the darkness.
There are a host of great looking RPGs in this charity supporting Itch.io bundle.
In addition to the usual downloads, there's a 50% off coupon for the hardback core rules and an original DS9 Uniform and Elite Services pack for the free to play Star Trek Online available in the tiers.
The sun is almost out of power, the moon is gone, and magic is dominant.
There's an Old School Gold bundle that has the likes of the ENnie-dominated Trilemma Adventures Collection, sci-fi horror Mothership, Golgotha and other popular titles.
The Savage World of Flash Gordon is a Kickstarter 2017 success and is based on Alex Raymond's original comic with nods to the 1980s movie too.
Shadowrun 6e is out, and to mixed reviews. That means we should be alert for cheap Shadowrun 5e deals from Catalyst Game Labs.
RPGs tend to grow by word of mouth. Perhaps Monte Cook needs some early Invisible Sun adopters on board to get those recommendations flowing.
In total, there are 26 ebooks worth £165.74 available for £18. They're available in ePub, mobi and PDF formats.