# Events

Events allow you to provide a function that will be run when an action occurs:

```lua
-- Execute entities when their health falls under 20
Events.EntityDamage(function(event)
    if (event.entity:getHealth() < 20) then
        event.entity.kill()
    end
end)
```

You can also modify (or sometimes cancel) event data:

```lua
-- Double all damage in the game after 15 minutes
Events.EntityDamage(function(event)
    local matchDurationSec = MatchService:getMatchDurationSec()
    if (matchDurationSec > 15 * 60) then
        event.damage = event.damage * 2
    end
end)
```

{% hint style="danger" %}
**WARNING:** Yielding in an event will delay the outcome of the event. Examples of yielding include `task.wait()`, while loops, using DataStoreService, or iterating over a very large set of objects.

It is **highly recommended** to use `task.spawn()`when waiting in an event.
{% endhint %}


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