You're a fast moving target. I was talking to you about GOTM 18 earlier today, via PM 
Treasure chests were introduced as an extra unit to help Conquest class players in GOTM 20, which was a Deity game (and my first GOTM submission - a diplo loss
). A treasure chest can be moved around, so it can be used to explore, and it can be disbanded for 10 shields in a town.
For GOTM 20 you have to use the GOTM 20 resources.pcx and resources_shadows.pcx files instead of the standard ones, to avoid missing resources. You'll find these files in /Art/resources storage/GOTM20 xxxx/, where xxxx can be 'plain', 'w letters smilies' or 'w letters smilies and bonus', depending on what extras you like on your resource icons.

Treasure chests were introduced as an extra unit to help Conquest class players in GOTM 20, which was a Deity game (and my first GOTM submission - a diplo loss

For GOTM 20 you have to use the GOTM 20 resources.pcx and resources_shadows.pcx files instead of the standard ones, to avoid missing resources. You'll find these files in /Art/resources storage/GOTM20 xxxx/, where xxxx can be 'plain', 'w letters smilies' or 'w letters smilies and bonus', depending on what extras you like on your resource icons.