[z2643] Implement script for spell 21050

This will fix quest 6661

Thanks tarwyn and Nett118 for the info

(based on commit 090e1a1)

Signed-off-by: Xfurry <xfurry@scriptdev2.com>

(based on commit SD2-TBC[s2687] - 77de4b8)

Signed-off-by: Xfurry <xfurry@scriptdev2.com>