Ziyang's item

I'm very sorry my English isn't very good, so the mod uses Chinese directly. However, I will try my best to learn English. This is my first mod about items, and I added a powerful ice sword. You can craft it with some simple materials. It has two functions: first, it applies a Slow 5 effect to nearby creatures when right-clicking; second, it deducts an additional 20% of the target creature's current health with each hit (ignoring defense and damage cap).