added isSkill condition authored by Lxlp's avatar Lxlp
## Description
Matches how many players the target mob has killed.
## Attributes
| Attribute | Aliases | Description | Default |
|-----------|-----------|----------------------------------------------------------------------|---------|
| kills | k | The number range to match | 0 |
## Examples
```yaml
Conditions:
- playerkills{k=>10} true
```
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