This is a useful tip for playing
disk 2 of Xenogears. At the dungeon where Rico gets
his new gear, there's this monster called Hamar, who
self-destructs after he glows red. The explosion is
lethal but the party can escape before Hamar blows up.
However, the trick here is to kill him before he blows
up and he will give a special item which increases the
rate of receiving rare items. (Actually, it goes to
100%.) The way to do it is to reserve some infinity or
level 3 attacks until he turns red. Once he starts
glowing, give it all to him. (Booster helps too!)
With the special item equipped, go to any forest &
fight white snails. These creatures were plentiful in
disk 1 but now they are quite rare. Killing these
creatures gives the speed belt (helps gears & human
battles). Besides this, there are many other special
items/equipment carried by monsters.