Ahoy!
I've fixed more bugs that were reported on the discussion page.
I've also added the "ring of anti-radiation". It's an iron nugget that prevents any radiation change (it won't increase OR DECREASE) when on the off-hand. Someone asked me to add it.
It comes with a new permission node:
vampire.give.ring
And a command to give yourself the ring: /v ring
You need that permission to use the command.

Among the bugs fixed, placing redstone on altar core blocks will no longer spam the altar message!