Reshef aka Resheph aka Reshpu aka Rashap
Ah, Resheph, Rashap, Rashpu, Reshef…. by any name…
He kidnapped my million-word novel inspired by Sutekh. He was meant to be a cameo, and now he is … a constant presence. Admittedly, I have reshaped him to be the deity of BDSM, not just war and pestilence, but I do not think it is far-fetched.
As far as devotional stuff is concerned, there is very little, but it is excellent. A poem by Ptahmassu Nofra-Uaa in the collection A Silver Sun and Inky Clouds: A Devotional for Djehuty and Set (2018) merges him and Sutekh.
Ptahmassu Nofra-Uaa is also the artist whose lush depiction of Rashpu (the Egyptian spelling of the name) comes very close to the way I imagine him. Search for Reshpu, Lord of Might.
Now speaking as a scholar of Semitic languages and the Near East (shit, I even got a Ph.D. in those matters, although for a much later period):
The Wikipedia page in English is actually very informative and comprehensive, even if a few references are missing. Quite a few articles can be found in full if you look for them.
The book by Cornelius is available for full download online.
Cornelius, Izak (1994). The Iconography of the Canaanite Gods Reshef and Baʻal: Late Bronze and Iron Age I Periods (C 1500-1000 BCE)
The one below by a renowned scholar of Semitic linguistics is probably the best single academic monograph. Expensive, but I got it through Hathitrust a few years ago as single images… just have to compile them some day.
Lipiński, Edward. Resheph: A Syro-Canaanite Deity. Orientalia Lovaniensia Analecta 181; Stu- dia Phoenicia XIX. Leuven: Peeters Publishers,. 2009.
Quite good, but technical, so not beginner material (I do not know what it is about Resheph and eastern Europeans):
Münnich, Maciej M. (2013). The God Resheph in the Ancient Near East
The first monograph about him is this one. Somewhat flawed, but easy to read for non-specialists:
Fulco, William J. The Canaanite god Rešep / by William J. Fulco. New Haven : American Oriental Society; 1976