The spawns are generated with crontab.
spawn table can be found here:
viewtopic.php?f=6&t=6152&p=48770#p48770
the code can be read as: spawn time // map // monster ID // additional options*
*[count: how many, item: extra drops, pos: exact map position]
example:
1.) 50 * * * * 3.-3 /s 85
-> at 0:50, 1:50, ... server time (so, once per hour), a monster ID=85 spawns on map 3.-3 on a random position.
2.) */10 * * * * 3.1 /s 57 hp:10000 xp:30000 str:40 arm:40 dex:20 item:177 pos:40.40
-> every 10min, a monster ID=57 with special stats spawns on map 3.1 at position 40.40 and drops item 177