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 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.

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

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

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.)