Have all kinds of boons: Tax, Fame, Honor, Experience, Glory, Favor, Gold, Silver, Bronze, Map, Strength, Dexterity, Constitution, Intelligence, Wisdom, Charisma, Luck, and best and rarest of all, Level
Tax- 100k gold to tax box for citadel
Fame- give 1 point of fame, which will stand for something later in the game
Honor- give 1 point of honor, which will stand for something later in the game
Experience- give specific amount of experience, maybe 1000, to that player
Glory- 10 glory points
Favor- completely fill you favor level, or if already at 2500, raise to 3000 temporarily
Gold- give a High amount of gold when saced, like 30k

Silver- give a Medium amount of gold when saced, like 20k

Bronze- give a Small amount of gold when saced, like 10k

Map- give a random map when saced, (kind of rare)

Strength- temporarily add +5 strength (rare)
Dexterity-temporarily add +5 dexterity (rare)
Constitution- temporarily add +5 constitution (rare)
Intelligence- temporarily add +5 Intelligence (rare)
Charisma- temporarily add +5 charisma (rare)
Luck- temporarily add +5 luck (rare)
Level- automatically raise the players lvl by one, (Very Rare)

If there are any objections to it, I would love for yall to post why. And please tell me if this sounds like a good formula. Or if you have any other feedback about it.
Thanks,
Shrouwder

Edit:
Have a chance to get a Boon from all chests, just make it harder to get a boon on the easier chests.
childish map- Have like a real low chance of getting a boon
simple map- Have a low chance of getting a boon
stained map- Have a ok chance of getting a boon
tattered map- Have a better chance of getting a boon
cryptic map- Have the best chance to get a boon
Also, with the amount of coins we get in the chest, they could be lowered as they are whenever you find an Ultra Rune.
Example;
When you look inside, you see:
A small chest
---------------- --------------------- ----------------
capacity small condition pristine
size Medium value (gold) 2
weight (lb) 2
A small chest contains:
Treasure
(fine) 6041 gold coins
(Glowing) Fame Boon
[instead of]
When you look inside, you see:
A small chest
---------------- --------------------- ----------------
capacity small condition pristine
size Medium value (gold) 2
weight (lb) 2
A small chest contains:
Treasure
(fine) 8607 gold coins