The dragon summoned by Arthas in WOW is called Sapphiron, and it is Kel'Thuzad's mount.

Saphiron was a blue dragon during his lifetime. During the Battle of the Frozen Throne in Warcraft III, Arthas met the blue dragon Sapphiron in Northrend. At that time, Sapphiron was an ordinary adult dragon under the blue dragon king Malygos, but he was attacked by Alsace. A sneak attack by the two heroes Sass and Anub'arak and a group of elite servants.

After Sapphiron was defeated and killed, Arthas used the power of corruption to resurrect Sapphiron into a frost dragon. The frost dragon Sapphiron became a minion of the Scourge.

Extended information:

In the game World of Warcraft, Sapphiron is one of the BOSSs in the team copy Naxxramas. There are five skills as follows:

1. 600 aura damage every 2 seconds, lasting from Aggro until the end of the battle. 30 ice resistance can reduce this damage to less than 200.

2. Physical attack ranges from 1400-2500 (crushing damage 2500-4000), delay 1.5s. The 120-degree frontal slash and the tail sweep are similar to the characteristics of all large dragons .

3. The Blizzard Dragon will rain 2 waves of blizzards on the ground at the same time. After being hit by the blizzard, you will be affected by the deceleration effect first, and will cause 3700-4000 damage to you after 2 seconds. Both waves of blizzards will affect you. The mound has an extensibility similar to that of Oro, so you need to judge its direction of movement and avoid it in advance.

4. A curse occurs every 30 seconds or so, with 7 random targets. The person hit by the curse will receive 2000 continuous damage every 2 seconds, and each person will return about 4000 HP to the ice dragon. You can be dispersed.

5. Aggro will ascend to the sky after 35 seconds, and spit 5 ice arrows at the ground after 10 seconds, with random targets. The person hit will receive about 3000 ice damage, be trapped in a refrigerator, and cannot be healed. People within 10 yards of the surrounding area will also receive 3000 damage from the base shot and cannot be resisted. Finally, the dragon will spit out a huge ice ball, causing 60k-120k damage to the entire field, and then the dragon will land.

Reference source: Baidu Encyclopedia - Saphiron