Doom does more dmg vs immunes. Fathom does more dmg everywhere else.
Doom pairs better with blizzorb. Fathom pairs better with pure blizz (pure blizz has 20 points in CM, doom -% resist helps make up for the gap).
Cold immunes will slow you down on lower pcount more than on higher pcount (you one-shot most things in low pcount except immunes).
Pure blizz usually performs better on higher pcount than blizzorb does.
conclusion:
doom and fathom aren't as a different as you think
I would agree with this sentiment 100%. I usually run fathom on my pure blizz, but when messing around with the orb hybrid and base CM build doom clearly won out. If I went max CM and left orb at 1 pt, especially if I skipped es, fathom would likely outperform it.
(sorry didnt mean to double post, just woke up)
This post was edited by Gilgameshed on Jul 9 2026 10:54am