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Is there any way to add/remove health after an entity has been created? For example, I'd like to have a X mob regenerate Y "hearts" when Z happens. Thanks for any help in advance.

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Why the -1? Modding is on-topic and this is a good question. –  Anko Feb 23 '13 at 3:20
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2 Answers

up vote 6 down vote accepted

There are two ways. Using MCP obfuscation mappings, the first and proper way to do so is with:

EntityLiving.attackEntityFrom(DamageSource, damageDealt);

You need to specify where the damage came from in the first parameter though, so the simpler one is to simply use:

EntityLiving.setEntityHealth(health);

Use this with getHealth so you can do stuff like entity.setEntityHealth(entity.getHealth() - 1);

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Use MCedit to give mobs more/less heath. Or you could give it something like 5 seconds before it gets a regeneration effect. If you havn't got MCEdit look it up on youtube and download it :)

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