User blog comment:GreenMoriyama/Izo, the Blizzard Prince/@comment-7709681-20160331023408/@comment-25235491-20160331085847

Primus, I tested it in my Sandbox and the passive gets ugly for some reason. Across my edits in my attempts to make it work, I've seen a "1000 string length limit" or something like that. Are you sure it was working perfectly for you? Otherwise, there are several things I don't quite like as much in your rework, such as the conversion into magic damage (which would make him a 100%-hybrid rather than slight hybrid) and Hoarfrost-only heal on Q. Damage reduction piled up on the shield is overdoing things imo. The self-disarm on E is out of thematic, seeing as the blade of ice surging from the ground definitely isn't Boreas, plus I don't think it's necessary to debuff the skill just for extra flavor... Your ult variation feels extremely weak too, seeing as the magic damage will never be applied fully, though the 30%~15% permaslow plus the dashes are really strong as far as Izo is concerned.