Okun's Catalyst is a Unique Focus in Diablo IV Season 15. It comes from random drop - not listed on any Lair Boss loot table in the community loot-table cheat sheet this dataset uses; no official Blizzard list confirms it.
Unique power
Ball Lightning orbits you, creating a static field that damages all enemies within for (140-180%) of Ball Lightning's damage per active ball, and granting Unhindered while the field is active.
Affixes
1,727 Damage Per Second
[1,256 - 1,884] Damage per Hit (1,256 - 1,884)
1.10 Attacks per Second (Fast)
+100.0% Inherent Ball Lightning Cast While Moving
+1-121 Intelligence (1-121)
+1-3 to Ball Lightning (1-3)
Where it drops
random drop - not listed on any Lair Boss loot table in the community loot-table cheat sheet this dataset uses; no official Blizzard list confirms it