[c12698] Improve proc of spell 50421

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

(based on commit [12506] - 6209439)
[c12699] Implement proc effect of spells 67712, 67758

related to items 47316, 47477.

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

(based on commit [12507] - 06283c9)

Signed-off-by: Dramacydal <PulLumBerMal@gmail.com>