This post here seems to indicate from old log files that it was a classic bug that the level check occurred on your target before self-casting, in this case the caster had Manaskin loaded (self-only) but had a lower level character targeted and received this 'too powerful' message:
https://www.project1999.com/forums/s...0&postcount=29
There is a February 2002 patch note mentioning that this is fixed:
Quote:
- Self-only level 51+ spells will no longer fail to cast if the caster
has a lower level character targeted.
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No clue if spells was truly just spells or implied to be songs + spells, but good chance it could be working as intended.
Edit: Link to the original post / nilbog reply would be helpful.