On the first round of combat, if the environment allows the creature to hide, the target must succeed on a Wisdom check (DC [15 + Dexterity modifier]) or be Surprised. If it successfully attacks a surprised target, the creature deals +1d6 damage and any creature with lower Strength than its own is Knocked Prone. The creature gains a +5 bonus to all Stealth checks and to Initiative.

When the creature succeeds on an attack roll of 15-20 on the d20, it seizes its prey between its jaws or claws and immediately deals an additional free attack. If the target's Strength is equal to or lower than the predator's, it is also Knocked Prone and Restrained. To break free, the victim must succeed on an opposed Strength check on its turn, which costs a movement action (and another to stand up if successful).