How many aura skills does Warcraft have? What's the use?

A * * * has nine auras, each race has two auras, and one is only used by wild monsters.

Human Alliance-Brilliant Aura Exorcist (can be upgraded to level 3) returns to the demon to speed up Kajia's flute.

Focus on aura paladins (can be upgraded to level 3) and increase the lion's horn of armor storm.

Orc Tribe-Enduring Aura Tauren Chieftain (which can be upgraded to Level 3) speeds up its movement and attacks Gannell's Drum.

The war drum aura can be multi-beast (not upgradeable), attacking the war drum 10%.

Soul of the Undead-Evil Aura Death Knight (can be upgraded to level 3) plus movement speed and life recovery speed, as well as the horn of destruction.

Vampire aura, the king of fear (can be upgraded to level 3). Melee soldiers absorb attack damage and turn it into a natural disaster drum bell with health value.

Night Elf-Strike Aura Mirana Nightshade (which can be upgraded to level 3) to increase the attack of ranged soldiers on Arya's flute.

Thorn Halo Jungle Guardian (Level 3) melee damage rebound (no props)

Some wild monsters-jackal leaders, dog-head soothsayers (like mice anyway) and ogre leaders who have increased their attack power by 10% by clicking aura (which cannot be upgraded).

Remarks: Although both the drum and the conductor increase the attack power by 10%, they are two independent auras and can be superimposed. In the unit state of Warcraft, the drum halo is the icon of 1 drum, and the command is the icon of 1 claw holding stick. Warcraft has a total of ***9 auras, and some equipment can have halo effect, but all of them only have halo effect of 1 level, which can cover halo effect above level 2.