Each of the islands (allods) has its own magic and its own laws of physics. In other words, on each server – magic, substances and materials of weapons and armor (steel, mithril, adamantine, etc.) works differently.
The table shows which material is relevant on which allod
| Allods (server) number | Material |
| #2 easy | leather and bronze (iron is rare) |
| #3 medium | iron, steel and mithril (rare adamant) |
| #4 medium | mithril and adamant |
| #5 medium | adamant and meteor |
| #6 hard | meteor and dragon leather |
| #7 horror+ | crystal |
Note: chain and open armor weighs significantly less than full armor.
Also… Leather armor has increased protection at server #2/3, although this is not written in the description of a particular item (check your character sheet).