Hi,
I'm playing as a Hunter and tamed a Mana Wyrm. It belongs to the Wind Serpent family and shares the same abilities, but it has no sounds — no attack sounds, no wound sounds, no death sounds, no aggro — completely silent, unlike other pets.
Other Wind Serpent family pets (Wind Serpent itself) have all their sounds working normally.
Possible reason: In sound.MPQ, there is no dedicated folder for Mana Wyrm under Sound\Creature\.
There's Sound\Creature\WindSerpant\ for Wind Serpent, but nothing for Mana Wyrm.