Krimhilde is a typeface originally published in 1933, which is mixing blackletter and sans-serif elements. Ralf Herrmann explains the background of its 2018 revival, continuing in the vein of his earlier monolinear blackletter Elfen-Fraktur.
Ralf Herrmann explains why some characters are hidden and what you can do about it in this Typography.Guru article
The sharp s (or “Eszett” as it is called in German) is a letter of the alphabet in Germany and Austria. Typography Guru Ralf Herrmann discusses the value, history and design of the character in this excellent post.