[12465] Add serverside spell 50574

[ci skip]
Signed-off-by: Schmoozerd <schmoozerd@cmangos>
[12466] Implement spells 48129, 60320, 60321

Original implemented by Tartalo and Faq at TC.
Thanks to NeatElves for porting

Signed-off-by: Schmoozerd <schmoozerd@cmangos>