Item effects.

I have an item effect idea. In a anvil (or new interaction block) you could use a lingering potion on an item, (similarly to enchantments) which would lead to effecting another entity with the applied effect. However, the effect could only be limited to effect level one, and depending on the level of the potion, the higher the potion level, the effect will last longer, up to five seconds. These weaknesses will be balances to the fact, that this idea would be very powerful and revolutionary for combat without them. This idea could also be compatible with another one of my ideas. https://feedback.minecraft.net/hc/en-us/community/posts/33415931334541-Grindstone-update-idea