Orb of Chance

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The effect of the Orb of Chance differs from its POE1 counterpart; instead, it is more similar to a Tainted Mythic Orb (or rather, a "non-Tainted" version of it).

Tainted Mythic Orb
Calculations
First, a baseline 50% chance to destroy the item is applied.
If the item survives, a weight table is constructed with weights based on all possible unique outcomes based on unique rarity tier.
If the weight sum is less than 2000, the remaining weight up to 2000 is considered chance to destroy the item.
The chance for a specific outcome can then be calculated by dividing by the specific unique's weight by twice the weight sum.
If the weight sum is less than 2000, the chance for a specific outcome can be calculated by dividing the specific unique's weight by 4000.

Estimated tier weights
Tier Weight
T0 ~3.75[2]
T1 ~27
T2 ~55
T3 ~315
T4 ~1600
T5 ~2000