Legendary offense (3/day). if the Undead Ice Wyvern fails an attack, it can have one more attempt to try again. especially apply's to the Rampage Legendary Action.

Multi-attack. The Undead Ice Wyvern makes two attacks: one with its bite and one with its stinger. While flying, it can use its claws in place of one other attack.

Frostbite. Melee Weapon Attack: +7 to hit, reach 10 ft., one creature. Hit: 11 (2d6 + 4) piercing and cold damage.

Claws. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) slashing damage.

Necrotic Stinger. Melee Weapon Attack: +7 to hit, reach 10 ft., one creature. Hit: 11 (2d6 + 4) piercing damage. The target must make a DC 15 Constitution saving throw, taking 24 (7d6) poison and necrotic damage on a failed save, or half as much damage on a successful one.

Frost Beam. a beam shoots 50ft forward inn a straight line that's 5 feet wide. players hit most succeed on a +14 dexterity saving throw. those who don't suffer necrotic and cold damage and are knocked prone.

Rampage (costs 7 actions). The Undead Ice Wyvern performs its frostbite attack, then its claws, then its necrotic stinger, then its frost beam. then it stands up like a bear and starts lashing its wing claws at you extremely fast. unless players/creatures succeed on a +23 dexterity and strength saving throw, they will be knocked prone and take double damage. all previous attack effects apply. if you are already knocked prone, you instantly fail the dexterity and strength saving throws. if it rolled a 15 or more during its previous attack (before it uses Rampage), it doesn't have to roll these attacks.