Grounding Shots is a new enchantment for the crossbow to give it anti-air/anti-flight capabilities. It goes up to three levels.

When a Grounding Shot crossbow hits a flying, hovering, or levitating target, they immediately drop to the ground, taking fall damage if they are vulnerable to it, and giving them the Gravity status effect, which blocks them from utilizing flight or hover-based abilities for a few seconds depending on the level of Grounding Shots (I considered making Gravity a potion effect in itself but I realized that it would be very overpowered). The Gravity effect is only applied if the target is in the air due to a special effect (simply jumping or walking off a ledge won’t count).

Mobs/players with the Slow Fall or Levitation effects, players using elytra, ghasts, blazes, parrots, phantoms, and vexes can all be affected by the enchantment. The Wither can also be affected, but the duration of Gravity is reduced compared to other mobs.