The Runeblood Blessing

Publisher's blurb: For the low, low price of one gold—in fact, today only, just a single silver shield!—you too can cast magic. As much as you like, as often as you like. It’s easy! And the blood-red rune on your face? It’s a symbol of the power you’ve gained. A symbol that’s becoming more and more popular among nobles, elites, adventurers, and the everyday folk of Ptolus. ... Suitable for 5e characters of roughly 6th level, or Cypher System characters of roughly third tier, and can be easily adjusted upward or downward in difficulty.