auto mastery = get_effect(this->cached_effects, this->get_mastery_spell_id(), effect_type_t::E_APPLY_AURA, effect_subtype_t::A_DUMMY, ignore_cache);

return this->base_mastery + static_cast<float>(((this->mastery_rating / __combat_ratings[Rating::MASTERY][this->get_level() - 1]) * 0.01) * (mastery ? mastery->_sp_coeff : 1.0f));