====== Treasure probability curves ======
With weighted treasure randomizations (''Tpro'' and ''Twildish''), the contents of treasure chests and quest rewards are selected based on a weighted probability, which differs according to their location.
When assigning a random treasure chest or quest reward item based on a curve:
* The randomizer selects an item tier at random, based on the weighting.
* A random item is then selected from the options within that tier. (See [[item stats tables]] for item tier information.)
''Tpro'' uses the weights described on this page exactly. ''Twildish'' applies a transformation to the weights first in order to boost item quality, as follows:
* new tier 1 weight = (old tier 1) * 7/8
* new tier 2 weight = (old tier 1) * 1/8 + (old tier 2) * 6/8
* new tier 3 weight = (old tier 2) * 2/8 + (old tier 3) * 5/8
* new tier 4 weight = (old tier 3) * 3/8 + (old tier 4) * 4/8
* new tier 5 weight = (old tier 4) * 4/8 + (old tier 5) * 3/8
* new tier 6 weight = (old tier 5) * 5/8 + (old tier 6) * 2/8
* new tier 7 weight = (old tier 6) * 6/8 + (old tier 7) * 1/8
* new tier 8 weight = (old tier 7) * 7/8 + (old tier 8)
The following are the weights for ''Tpro''. The full list of ''Twildish'' weights is available [[treasure_probability_curves_twildish|here]].
//Note that the ''Tmaxtier'' flag will prevent items with higher tiers from appearing in untrapped chests. The relative weights of the remaining tiers will remain the same.//
===== Untrapped chests =====
Each untrapped chest receives its item based on the area where the chest is found.
^ Area ^ Tier 1 ^ Tier 2 ^ Tier 3 ^ Tier 4 ^ Tier 5 ^ Tier 6 ^ Tier 7 ^ Tier 8 ^
| Baron Town | 40 | 20 | 20 | 18 | 2 | 0 | 0 | 0 |
| Baron Town Weapon/Armor Shop | 10 | 10 | 45 | 25 | 10 | 0 | 0 | 0 |
| Chocobo Forests | 10 | 20 | 30 | 20 | 18 | 2 | 0 | 0 |
| Mist Cave | 0 | 0 | 40 | 40 | 18 | 2 | 0 | 0 |
| Village Mist | 20 | 30 | 30 | 18 | 2 | 0 | 0 | 0 |
| Kaipo | 10 | 30 | 40 | 18 | 2 | 0 | 0 | 0 |
| Watery Pass | 10 | 20 | 30 | 25 | 13 | 2 | 0 | 0 |
| Waterfall/Lake | 0 | 0 | 40 | 40 | 18 | 2 | 0 | 0 |
| Damcyan | 40 | 20 | 20 | 18 | 2 | 0 | 0 | 0 |
| Antlion Cave | 30 | 20 | 20 | 25 | 5 | 0 | 0 | 0 |
| Mount Hobs | 10 | 10 | 45 | 25 | 10 | 0 | 0 | 0 |
| Fabul | 20 | 30 | 30 | 18 | 2 | 0 | 0 | 0 |
| Mount Ordeals | 10 | 10 | 45 | 25 | 10 | 0 | 0 | 0 |
| Sewer | 10 | 10 | 45 | 25 | 10 | 0 | 0 | 0 |
| Baron Castle | 10 | 20 | 30 | 25 | 15 | 0 | 0 | 0 |
| Agart | 10 | 30 | 40 | 18 | 2 | 0 | 0 | 0 |
| Silvera | 10 | 30 | 40 | 18 | 2 | 0 | 0 | 0 |
| Toroia Town | 10 | 30 | 40 | 18 | 2 | 0 | 0 | 0 |
| Toroia Castle | 10 | 30 | 35 | 21 | 4 | 0 | 0 | 0 |
| Toroia Castle Treasury | 0 | 8 | 20 | 20 | 40 | 10 | 1 | 1 |
| Cave Magnes | 0 | 20 | 40 | 30 | 10 | 0 | 0 | 0 |
| Tower of Zot | 10 | 10 | 35 | 30 | 15 | 0 | 0 | 0 |
| Dwarf Castle | 10 | 25 | 35 | 28 | 2 | 0 | 0 | 0 |
| Lower Bab-il | 10 | 10 | 30 | 30 | 20 | 0 | 0 | 0 |
| Eblan | 10 | 10 | 25 | 30 | 23 | 2 | 0 | 0 |
| Cave Eblan | 10 | 10 | 40 | 25 | 15 | 0 | 0 | 0 |
| Upper Bab-il | 10 | 10 | 35 | 30 | 15 | 0 | 0 | 0 |
| Upper Bab-il (after fall) | 10 | 10 | 35 | 30 | 15 | 0 | 0 | 0 |
| Tomra | 10 | 20 | 40 | 28 | 2 | 0 | 0 | 0 |
| Smithy House | 10 | 10 | 30 | 30 | 20 | 0 | 0 | 0 |
| Sylvan Cave | 8 | 12 | 25 | 30 | 23 | 2 | 0 | 0 |
| Cave of Summons | 0 | 25 | 25 | 30 | 20 | 0 | 0 | 0 |
| Town of Summons | 10 | 20 | 40 | 28 | 2 | 0 | 0 | 0 |
| Sealed Cave | 10 | 10 | 30 | 30 | 20 | 0 | 0 | 0 |
| Cave Bahamut | 8 | 12 | 30 | 30 | 18 | 2 | 0 | 0 |
| Lunar Path | 8 | 12 | 30 | 30 | 18 | 2 | 0 | 0 |
| Giant of Bab-il | 0 | 10 | 30 | 30 | 26 | 4 | 0 | 0 |
| Lunar Subterrane/Core | 0 | 10 | 25 | 20 | 41 | 4 | 0 | 0 |
===== Trapped chests =====
Trapped chest rewards have their own distinct weightings:
^ Trapped chest location ^ Tier 1 ^ Tier 2 ^ Tier 3 ^ Tier 4 ^ Tier 5 ^ Tier 6 ^ Tier 7 ^ Tier 8 ^
| Tower of Zot | 0 | 0 | 0 | 10 | 40 | 30 | 15 | 5 |
| Eblan | 0 | 0 | 0 | 0 | 30 | 30 | 30 | 10 |
| Cave Eblan | 0 | 0 | 0 | 20 | 40 | 25 | 10 | 5 |
| Lower Bab-il | 0 | 0 | 0 | 30 | 45 | 13 | 10 | 2 |
| Upper Bab-il | 0 | 0 | 0 | 10 | 60 | 15 | 10 | 5 |
| Cave of Summons | 0 | 0 | 0 | 5 | 45 | 35 | 10 | 5 |
| Sylvan Cave | 0 | 0 | 0 | 5 | 30 | 30 | 25 | 10 |
| Giant of Bab-il | 0 | 0 | 0 | 0 | 30 | 30 | 25 | 15 |
| Lunar Path | 0 | 0 | 0 | 0 | 40 | 40 | 10 | 10 |
| Lunar Subterrane/Core | 0 | 0 | 0 | 0 | 10 | 20 | 50 | 20 |
===== Misc quests =====
Potential key item locations that do not award a key item (other than trapped chests, which are described above) receive rewards based on the weighting below. ("Ungated" quests are quests that can be completed without access to any key items.)
^ ^ Tier 1 ^ Tier 2 ^ Tier 3 ^ Tier 4 ^ Tier 5 ^ Tier 6 ^ Tier 7 ^ Tier 8 ^
| Ungated quests | 0 | 0 | 0 | 40 | 60 | 0 | 0 | 0 |
| Gated quests | 0 | 0 | 0 | 10 | 40 | 40 | 10 | 0 |
| Moon quests | 0 | 0 | 0 | 0 | 30 | 50 | 15 | 5 |