Remathilis
Legend
If it appears in the SRD or the Tome of Horrors or some other OGC source, you're fine. Otherwise, basically, you aren't.
Hmmm....
That's going to put a cramp in some of that conversion. While some stuff (proper names) is easy to remove, I'm concerned about a few more elements...
* Are spell descriptions (Such a Know Age or Call Upon Faith) verboten? Can I get away with similar spell effects written in 2e formats? Is the names off limits?
* Can I use class/kit names like Samurai, Crusader, Mystic, Bladesinger, or Battlerager, since they aren't proper nouns but common nouns and compound words?
* Several ToM spells make reference to the Battlesystem rules. Should I omit these references?
* Is there a list of monsters that the Tome of Horrors converted? I (sadly) never purchased it.