The system is roughly there for uber boss fights to be quickly incorporated into the Weaver / Woven Echoes system. Suggestion to create end-game boss fights for Nemesis, Exiled Mage, and Rift Beast for quick wins targetted for corruptions 250-550. Obtaining method can be roughly similar to what is already currently done (drop from a high difficulty themed encounter) and reworked later as needed (as clearly evidenced by how POE is continually forgiven for access method changes), and reward can be similarly themed as well (e.g., primordial exalted with 2 primordial affixes, multiple experimental affixes, nemesis egg that guarantees at least 2 legendary potential).