Code:
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*
* MANUAL:
*
* 1. Placing functional Pandora's Box
*
*     FU920000:Px/y/l;
*
*     If operation is successful, flag 1 will be set.
*
*     NOTE: There can only be 200 different boxes on the map at the same time.
*           There is no limit to a number of boxes throughout the game.
*
* 2. Setting message on visit
*
*     FU920001:Px/y/l/var_index/-1;
*            - sets message to a specified z-var
*
*     FU920001:Px/y/l/array_index/elem_index;
*            - sets message to an element of an Era array (SN:M)
*
* 3. Setting guards
*
*     FU920002:Px/y/l/position/type/quantity;
*
*     This works similarly to AR:G command.
*
* 4. Setting experience and spell points rewards
*
*     FU920003:Px/y/l/0/amount;
*            - sets amount of experience
*
*     FU920003:Px/y/l/1/amount;
*            - sets amount of spell points
*
*     To take spell points set corresponding reward to a negative number.
*
* 5. Setting morale and luck rewards
*
*     FU920004:Px/y/l/0/amount;
*            -sets amount of morale
*
*     FU920004:Px/y/l/1/amount;
*            -sets amount of luck
*
*     To take morale or luck set corresponding reward to a negative number.
*
* 6. Setting resource rewards
*
*     FU920005:Px/y/l/resource/amount;
*
*     To take resources set corresponding reward to a negative number.
*     See Format R for resource IDs.
*
* 7. Setting primary skill rewards
*
*     FU920006:Px/y/l/skill/amount;
*
*     See Format PK for primary skill IDs.
*
* 8. Setting secondary skill rewards
*
*     FU920007:Px/y/l/0/Era_array_ID;
*
*     For info on Era arrays see SN:M.
*     Array must contain twice as much elements as the amount of skills you want
*     to give. Each pair of elements represents a secondary skill ID and a level
*     of that skill.
*     See Format SS for secondary skill IDs.
*
* 9. Setting artifact rewards
*
*     FU920007:Px/y/l/1/Era_array_ID;
*
*     For info on Era arrays see SN:M.
*     Array must contain IDs of artifacts you want to give for a reward.
*     See Format A1 for artifact IDs.
*
* 10. Setting spell rewards
*
*     FU920007:Px/y/l/2/Era_array_ID;
*
*     For info on Era arrays see SN:M.
*     Array must contain IDs of spells you want to give for a reward.
*     See Format SP for spell IDs.
*
*     NOTE: A hero needs corresponding Wisdom level to learn high level spells.
*
* 11. Setting creature rewards
*
*     FU920008:Px/y/l/position/type/quantity;
*
*     This works similarly to AR:G command.
*
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