mangosR2/mangos — comment on commit 225b34daa1a2bd60acb0530efa237c61cf96351b
File: src/game/SpellAuras.cpp line 10596
By Zakamurite:

maybe GetSpellSchoolMask(m_spellProto) & (SPELL_SCHOOL_MASK_ARCANE | SPELL_SCHOOL_MASK_HOLY) ?