I was thinking the other day and realized I'd never actually seen any chemical weapons used hell in WW1 A large factor of warfare was the usage of chemical weapons, It would be a massive game changer if you could encircle an enemy city and use your naval ships to bombard it with chemical weapons would also bring about the need for gas masks and bomb shelters which would be an interesting mechanic added to cities and infantry.

|How it could be coded/implemented|
- You could code gasmasks using pumpkins as a base.
-You could code the chemical shells using the smoke shells as a base.
-Lingering splash potions of wither/harming/poison could be useful for it combined this with a small concussive explosion effect.