# Build Mobs With Blocks

## How do block patterns work?

Building mobs with block patterns mimics the vanilla feature where Withers, Iron golems or snowmans can be built. Players must make a specific pattern for a mob to spawn - the block pattern disappears. Best explained by this gif:

<figure><img src="/files/VygROSexucyBwS06TRkf" alt=""><figcaption></figcaption></figure>

## How to customize / make your own patterns?

You will need to do this all inside `plugins/AdvancedMobs/bosses` folder. If you are customizing an already available pattern, find the file named same as the mob you want to change, otherwise, create a new file called `<mob name>.yml`, example: `Wyvern.yml`

We're going to be customizing a default pattern of Wyvern mob. The inside of file looks like this:

{% code title="plugins/AdvancedMobs/bosses/Wyvern.yml" overflow="wrap" lineNumbers="true" %}

```yaml
# Boss Configuration file for Wyvern

# How to build Wyvern boss
build:
  pattern:
    - ' e '
    - 'idi'
    - ' d '
  materials:
    e: ENCHANTING_TABLE
    i: IRON_BLOCK
    d: REINFORCED_DEEPSLATE
```

{% endcode %}

Patterns are very simple to understand. Use empty space    to act as an AIR block, otherwise specify material names below the pattern list. As an example, in our file, `e` means ENCHANTING\_TABLE.&#x20;

Here is a visual representation of how this pattern looks:

<figure><img src="/files/jbOIVDUYDq4ybLNm46WT" alt=""><figcaption></figcaption></figure>

Because there's 3 lines, and 3 materials in each line, this is a 3x3 pattern. A very basic 2D pattern. You can have as many lines in height or width as you want.


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