Soma has a wide range of powers and abilities called 'souls' which are categorized as offensive, defensive, or tactical. He acquires these abilities through his "power of dominance" - the power to control and summon the souls of defeated monsters. This is a derivation of Dracula's primary power, the ability to command monsters.
Soma fights with a variety of weapons, including swords, spears, and axes. Many of his weapons are references to mythology and folklore, such as the Valmanway, Longinus, Excalibur, or Claimh Solais (even Death's Scythe). The whip sword is a reference to the Castlevania series' tradition of whips as primary weapons, but is the only weapon in Aria of Sorrow that resembles a whip. Soma can also use handguns, a Rocket Propelled Grenade, and a Positron Rifle, in an interesting (and futuristic) departure from other games in the Castlevania series.