Damage multiplier if shot

I have an event for when a player gets damaged by a bow, but how could I give them increased damage for 10 seconds?

 

Increase all damage or sword damage?

For just a simple sword damage you can give them the strenght potion effect.

For all damage you can add players to a hashmap with a 10 second delay then watch EntityDamageByEntityEvent
setting the damage to be the damage + multipler(An integer).

When the player gets damage by a bow you can add the damager to a list or hashmap and then schedule a task to remove said player from list after 20 * 10 ticks.

If your going to store a player in a hashmap or list please use there UUID.

Note: You can use a hashmap to continue increasing the damage multipler every time you shoot someone even with a max multipler if you really want.

Just tell me if you need any help with anything.

 

The point of a damage multiplier is that you multiply it to the damage, not add it

 

Multiple could mean * x . . . . . . . . . Im not stupid I SWARE! XD