Shiroyasha2910
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While such a request is feasible, it involves a whole range of tasks, starting with disabling the standard bonus for the Necromancer artifact set (if you want it to have its own unique bonus, rather than a combination of its own and the standard bonus), writing a complex combat script, and then linking this combat script to the hero with these artifacts in the regular script.
There's no need to disable the standard bonus; checking for the presence of artifacts is very easy. The second part does indeed seem very complex. Do you want to say that it's best to forget about it for now?