Queenmagic, Kingmagic (1986) 205 pages by Ian Watson
The kingdoms of Bellogard and Chorny are in a magical war which when there is a winner will be the end of existence, but the war is also what brings life to the world. Pedino describes a couple of childhood adventures, the latter concluding with Bishop Slon discovering that Pedino has a full magical soul and is the last of the Bellogard squires. He then studies a couple of years at the palace before going on his first mission where he falls in love with Sara, one of the opposing squires, but acquits himself well by dispatching Bishop Zorn. Four more years pass and he is sent on mission to Chorny.
The characters with full souls are analogues of chess pieces -- Prince, Sir, Squire being a rook, knight and pawn. Those characters have there particular type of magic whether it's straightforward magic, slantwise magic, etc. It gives a flavor to the book.
The other tone that is set is that there are cycles. Pedino visits the bibliotek where Bishop Veck shows him volumes that are blank, and tiny volumes that are filled with miniature writing. Presumably from previous cycles. Watson uses a snake symbol that is a barrier between the universes. Which I assume is an Ouroboros reference.
It's not just a novelty there is a good overall story built upon smaller stories. Pedino grows from a naive boy to a man. Good solid writing.