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Viewing post in Echoes of the Hunt jam comments
I think the most important is state machine architecture of your AI code. That is something that allow you easly scale up your AI behaviour. Here monster has several states and i switch between them according to situation.
You can learn more about more complex AI by looking for something that is call "Steering Behaviors" for AI, you can find a lot materials about it in the web. That techniques allow you build really complex AI.