Monsters are the non-player, attackables NPCs in OSO


  • Mash Apes (aggressive)

monkeys covered with dark brown fur and malformed arms, with fists hard as stone. Usually found in packs (of 3 in the tutorial leve)

West Edit

Plains Edit

  • Herbivores (non aggressive)

Drop : Fur

  • Sandman

Forest Edit

at night
  • Wild Dogs

Drops : Fangs, Dog Fur

  • Flying Bats

Drop : Poison Blood, membranes


  • Armadillos

Drops : Stone Scales

  • Rock Crab.

Drops : Rock Crab's meat

Boss : Golem, physical defence is high

East Edit


  • Big Boar

Drops : Big Boar's Meat, Fangs, Big Boar's Fur.

  • Goblins

Drops : Goblin's Horn

  • Slimes

Drops : Blue Jelly

Further :

  • Mill Bird
  • Grey Rat.

Crystal CaveEdit


  • Poison Dozers (Centipedes, 50cm wide)
  • Boss : Acid Dozer (like Centipede but x3 bigger). Saliva is acid
Drops (for the 2) : Venomous Insect's Shell, Acid Liquid
Collection points
  • Iron Ore
  • Fossil (random rare chance ?)

【Crystal Tree】's GardenEdit

The room behind the boss area. Unlike the rest of the cave, has an open ceiling and light floods from above. Contains a garden of flowers and a giant crystal tree, of which the players can harvest one branch as a reward.

Crystal Tree's Branch 【Important Item】


  1. vol1ch3

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