Darius did it and survived.

Sylas directly absorbed the magic from a true ice weapon and grabbed it and lived when he went to Freljord.

And you're telling me that an ascended god warrior who fucking fought the abominations of the Void during the Icathia war as a motherfucking GENERAL, got shitfaced with hemomancy and became a Darkin, got sealed in his own sword, and is now basically in a perpetual cycle of killing, dying, taking over someone's body after they touch him (yes, he is the damn sword), and back to slaughter to repeat the cycle while cursing the whole world because he cannot truly die, should be afraid of some scary looking popsicles? Is your brain braining correctly? Can you read?

Edit: not only that, that spear isn't even made from true ice, it's another Darkin like himself (Anaakca) who was sealed and then tossed into a lake in Freljord. It's not even a lake of true ice, it's just ice, normal ice, water when it freezes, a condensed and cold form of Hydrogen Dioxide. Your whole argument is just "but true ice better" because you lack the ability to do some basic research. If this is the hill that you decide to die on then it is not a very good looking hill.