I just tried an Ice Skull to test for immunity and it the Ice Skull worked. My Ice Skull only has a 21-22% effect meaning it only slows it down by 21-22% and for an unknown duration. So it might just be that the % on you items might just be too low to have a noticeable or meaningful affect.
Most of the bosses are slow so 20% would make a big difference. However, you'll notice it more in movement speed and they are so big they don't move much.
Yeah, I think you're correct. The effects on my weapons are between 40 and 50%, but I think the thing that threw me off was the lack of the visual effect. Seems like they're working at least today.
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Thanks!