====== 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 regular (non-MIAB) chests. The relative weights of the remaining tiers will remain the same.//

===== Regular chests =====

Each chest receives its item based on the area where the chest is found.

<sortable>
^ 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 | 35 | 40 | 23 | 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 | 35 | 40 | 23 | 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) | 0 | 10 | 35 | 30 | 15 | 10 | 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 |
</sortable>
===== MIABs =====

Monster-in-a-box rewards have their own distinct weightings:

<sortable>
^ Area ^ 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 | 20 | 0 |
| Eblan | 0 | 0 | 0 | 0 | 30 | 35 | 35 | 0 |
| Cave Eblan | 0 | 0 | 0 | 20 | 40 | 25 | 15 | 0 |
| Lower Bab-il | 0 | 0 | 0 | 30 | 45 | 13 | 12 | 0 |
| Upper Bab-il | 0 | 0 | 0 | 10 | 60 | 15 | 15 | 0 |
| Cave of Summons | 0 | 0 | 0 | 5 | 45 | 35 | 15 | 0 |
| Sylvan Cave | 0 | 0 | 0 | 5 | 30 | 30 | 35 | 0 |
| Giant of Bab-il | 0 | 0 | 0 | 0 | 30 | 35 | 35 | 0 |
| Lunar Path | 0 | 0 | 0 | 0 | 40 | 40 | 20 | 0 |
| Lunar Subterrane/Core | 0 | 0 | 0 | 0 | 10 | 20 | 50 | 20 |
</sortable>
===== Misc quests =====

Potential key item locations that do not award a key item (other than MIABs, 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.)

<sortable>
^  ^ 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 |
</sortable>