Heusler

1. Start in any venue! Once you start though, you're locked in one area until you finish the challenge and then move on to the next area. You can jump around to wherever you want as you farm!

2. The very first battle you have, and the very first drop you have, that's the item you have to collect until you have a stack of 99! Other notable drops are eggs, battle stones, apparel, anything unusual! However you're locked into that venue until you get a stack of 99 of whatever item you're after.

3. You can totally take a break, come back later, but you're not allowed to coli farm anywhere else but that venue until your task is completed. The exceptions to this are Festivals, training fodder, or to simply take a break from the ridiculous Coli grinding.

4. To determine what your drop is, it's the very first thing that drops from the very first battle. Exceptions include, but are not limited to, familiar drops, boss drops, battle stones, and apparel drops. This is meant to be a challenge for fun, don't feel trapped by getting that drop that is impossible to get.

5. Once you finish a venue, you can't go back until you completely finish the challenge. (Again, exceptions are made for Festivals and training fodder)