Put the rgnpc (ninjin) model pack in this folder, keeping the layout the mod used to ship in
the jar:

  geo/entity/ragnarok/<model>.geo.json
  textures/entity/ragnarok/<skin>.png

They are streamed to each player on join and held only in memory on their side, so they
are never written into the mod jar or left on a player's disk as openable files.
Restart the server after changing them.
