English list: http://wlodb.com/monsters
Chinese list: https://wl.chinesegamer.net/index_p1_b2.asp
Monster Level
Level 1 and above: purple chest
Level 10 and above: Octopus purple key
Level 50-69: Alchemy Book 1, Glaze stone
Level 70-89: Alchemy Book 2, Glaze stone
Level 90-119: Alchemy Book 3, Glaze stone
Level 100 and above: Magic Set Box
Level 120 and above: Alchemy Book 4, Glaze stone
Take note: