Magic Resistance.

The phisarazu has advantage on saving throws against spells and other magical effects.

Spider Climb.

The phisarazu can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Web Sense.

When in contact with a web, the phisarazu knows the exact location of any other creature in contact with the same web.

Web Walker.

The phisarazu ignores movement restrictions caused by webbing.

Actions

Multiattack.

The phisarazu makes one Bite attack and two Claw attacks. It can replace one of these attacks with Scintillating Spray if available.

Bite.

Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 15 (2d10 + 4) piercing damage plus 9 (2d8) poison damage, and the target has the poisoned condition until the start of the phisarazu's next turn.

Claw.

Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 22 (4d8 + 4) slashing damage.

Scintillating Spray (Recharge 5–6).

The phisarazu expels shimmering webs in a 60-foot cone. Creatures and objects in that area are outlined by the glittering webs for 1 minute, during which time they emit dim light for 10 feet and can't benefit from the invisible condition. Additionally, creatures in that area must succeed on a DC 16 Wisdom saving throw or have the stunned condition for 1 minute. A stunned creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Bonus Actions

Change Shape.

The phisarazu transforms into a crab, drider, or giant crab, or returns to its true form. Its game statistics, except for its size, are the same in each form. Any equipment it is wearing or carrying isn't transformed.

Phisarazu Spyder-Fiend