Aquatic Aquatic models can move within any area of water on the battlefield as if it were open ground. They are still subject to any special effects that specific terrain may have.
The models can march, claim rank bonus and be steadfast even when in water. If every model in a unit is Aquatic, and the majority of the unit is within water terrain, enemies shooting at that unit suffer an additional -1 To Hit penalty.
Arcane Vassal A Slann Mage-Priest can choose to cast any magic missile or direct damage spell through an Arcane Vassal within 24" of him. If he does so, measure the spell's range from the Arcane Vassal and use that model's forward arc and line of sight for the purposes of casting the spell. If using an Arcane Vassal, a Slann Mage-Priest can cast magic missiles, even if his own unit is engaged in close combat (provided that the Arcane Vassal's is not). If a spell cast through an Arcane Vassal is miscast, the result of the miscast is applied to the Slann Mage-Priest, but the Arcane Vassal suffers a S 3 hit.