The problem with the current state of Ymir is that he gives items far to expesnive to bother with.
5 ice shards for a piece of ice…which is easy to gather is meh. As is black ice. It’s easy to get.
The arrows have utility. But I figure they should have a secondary effect. Chill or perhapa even the water orb effect to put out fires.
But asking for feathers, branches and a heck of a lot of ice shards is meh. Foe Shatter is ok. Looks cool, but I don’t even bother putting down a Ymir Shrine.
Zeal for arrows like Set would make him useful. But you need to masacre entire cities for enough shards to make 30 arrows.
Overall. Just not economic. You dont need Foeshatter. There are better options.