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 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.)

Twildish applies a transformation to the Tpro weights 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 approximate weights for Twildish, calculated based on the formulas above. The Tpro weights are available here.

Note that Tmaxtier:6 will prevent tier 7+ items from appearing in untrapped chests. If a chest would contain a tier 7+ item, instead its tier is randomly re-selected.

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

Trapped chest rewards have their own distinct weightings:

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.)