Again my limited knowledge and understanding blocks me.

What exactly is "IDamageable" and can I make it work with Pub54?

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IDamageable is found in Interfaces.cs and was part of a major update to the core files. The change effected mobiles and damageable items and would not be easy to add to a version that doesn't currently have it.
 
Maybe find an older resource for them? Evo creatures have been the topic of many resources. What version of ServUO / RunUO are you using?
 
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