Hello. Regarding conflicts, OnEntityTakeDamage is an On object hook, meaning its return value doesn’t matter for plugins. It's just a warning that can be ignored, it doesn't affect anything, aside from being annoying with console messages.
Oxide simply doesn’t account for this when checking for hook conflicts. I actually submitted a PR today to add support for such hooks.
Hopefully, MrBlue approves my pull request, which removes these persistent conflict messages for hooks where the type doesn’t matter. Plus, it includes a delay between messages to prevent spam.
https://github.com/OxideMod/Oxide.Core/pull/103