Story role vs gameplay gate
Lore-wise, each relic represents a biome the wizard drained — forest tear, fallen sun shard, ancient grain gift, earth heart. Mechanically, they are progress tokens the castle puzzles read before spawning the bow, library sort, and spell targets.
There is no "best relic first" speedrun order — map progression is linear. You always earn them in forest → ruins → restaurant → temple sequence because the lobby will not load later maps early.
Link to boss prep
After the fourth relic, open the Boss Fight guide for ten books, arrow colors, magic word Harry, and spells Ignis / Fulgur. Relics do not appear in combat inventories; they simply prove you finished the prerequisite maps.