skill_begin skill_name=[s_prophecy_of_fire2] skill_id=1356 level=2 ... effect={...{p_speed;{all};-20;per}} ... skill_end
skill_begin skill_name=[s_prophecy_of_fire_d_penalty2] skill_id=1356 level=302 ... effect={...{p_speed;{all};-15;per}} ... skill_end
Обратите внимание, что не -20 / -15, а -20 процентов / -15 процентов