Hey Firlefanz73,
I hope you are well and thanks for your message. ABC is still very much supported however most of this now occurs on Discord 
Please find some answers to your questions below:
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The AI navigation in ABC requires a NavMesh, can you double check this has been added and correctly configured for your terrain environment. More information on setup can be found here: A guide on using the new AI Navigation package in Unity 2022 LTS and above
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You certainly can have a 4 legged enemy, the generic rig issue was fixed in a recent update so I would recommend making sure you have updated ABC to the latest version. Once the 4 legged enemy has been setup, just replace the animations with the generic ones attached to the model. A video example can be found here: https://youtu.be/VBoUdEVsSkY
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For an ability that hurts on touch (collision), I recommend looking at the Negative - Aura ability in the global portal abilities library. This has been setup, so that it attaches to the caster, hurting anyone who enters the collision radius. I have posted some pictures below of the important settings to get this effect.
I hope that helps and you have a lovely week 