Thread:Ollerus/@comment-5275759-20190420222036/@comment-24758887-20191023134627

English fan translation used either "spellcaster" or "caster" upto OT9. I haven't checked OT10 and onwards yet. I'll check them asap.

Edit. 術者 is written in raw text of OT10, 11, 13 and translator translated them to caster. Even if 術者 is written in OT18, and 21, translator translated them to "magic user".