Body
For Van Helsing and Katarina, each point of Body gives +1% Melee Damage, +5 HP, and +2 Defense.

Dexterity
For Van Helsing and Katarina, each point of Dexterity gives +1% Ranged Damage and +1 Dodge.

Willpower
For Van Helsing, each point of Willpower gives +3 Mana Points and +1% Spellpower.
For Katarina, each point gives +1 Resistance to all attacks.

Luck
For Van Helsing, each point of Luck gives +1% Find Gold Chance, +0.5% Find Magic Item Chance, +1 Dodge, and +1% Critical Damage.
For Katarina, each point gives +0.5% Find Gold Chance, +0.25% Find Magic Item Chance, +1 Dodge, and +1% Critical Damage.