You only get one swift action per round.
Adding the beam to the attack line makes good sense.
Gaunds have 90’ infravision, excellent hearing, and great sensitivity to vibrations. This prevents them from being effectively blinded by exposure to light or darkness, or by the obscuring effects of smoke or vapors. They are surprised only on a roll of 1 on a 1d6.
In combat, gaunds do not use weapons of any sort, but leap about constantly, hurling themselves at and upon opponents, slashing with their claws (1d4 points of damage), snapping with their jaws (1d6 points of damage), and using their tails as lashes or whips (1d8 points of damage).
They are fearless, and the death of a fellow often drives them to fight with even greater ferocity.
Gaund suffer no damage at all from heat or normal fire, even dragon turtle steam. Magical fire attacks inflict less damage upon them, causing 2 points of damage per die, with a minimum of 1 point of damage per die. However, they are especially susceptible to cold-based attacks (+2 to each die of damage). They are also susceptible to sonic attacks and make saving throws against them at a penalty of -2.
Darkvision 90 ft, tremorsense 60 ft, +4 on Listen seems fine.
Leap is good, but I'm not sure which attacks to allow with it. It's not quite a full attack like pounce (for the bullette), but maybe we could add the rake.
I'd probably go with a rage, though ferocity is a possibility.
Resistance to fire 10 and those vulnerabilities sound good.
Gaunds are omnivorous. Although they do not build, use tools, or seem to have any type of social structure, they do husband food carefully, often maintaining breeding colonies of lesser animals to ensure themselves of a plentiful supply.
On second thought, that sounds exactly like pounce, eh?
Immunity to fear and resistance to fire 15 are fine.
Skills: 14 ranks
Handle Animal, Jump, Knowledge Nature, Listen?
Feats: 2
Multiattack, Skill Focus (Jump)?