Melkoth's Mystifying Miasma is a hex with a range of 24". The target unit's Weapon Skill, Ballistic Skill, Initiative or Movement (you choose which) is reduced by D3 (to a minimum of 1) until the start of the caster's next Magic phase. The Wizard can choose to cast a more powerful version of this spell that instead reduces all four characteristics (don't roll a D3 for each – make one roll and apply it to all four characteristics). If they do so, the casting value of Melkoth's Mystifying Miasma is increased to 10+.