Slow down guys, it’s a bug: Channeling Damage Bugs
When using Arcane Torrent, you appear to double-dip on the Deathwish and Etched Sigil bonuses. The Deathwish/Etched Sigil bonuses get applied, then applied again multiplicatively. It doesn’t happen with Disintegrate or Ray of Frost.
There seems to have been a bug with the Etched Sigil/Deathwish fix in relation to Arcane Torrent.
So the build is gaining an extra 10x multiplier it shouldn’t have.