Runestone / Imbued Runestone does not seem to take into account elemental tag changes, and rotates from element to element.
This prevents conversion from Freezing Point (Shred chance to Frostbite).
From Runebolt tree, taking Ice Shard or Frost Spikes do not seem to have an impact, they are simply ignored. Amplified Cascade too however I left it unallocated for testing.
How to replicate :
-
Get 7 points in Freezing Point and some Shred on items
-
Allocate Runestone/Ice Shards/Frost Spikes
-
Spam runebolt on target, runestone will spawn
-
Depending on the chosen element, shred or frostbite will ramp up
-
Keep spamming until new runestone pops
-
Repeat to see frostbite ramp up only with 1 out of 3 runestones