extended fell drain magic missile?

[With a box]

1. is lt ligal?
2. then it's negative level is now act like other negative levels? (with failed save after 24 hours later)

[Necroticplague]

1. is lt ligal?
2. then it's negative level is now act like other negative levels? (with failed save after 24 hours later)

Fell Drain:yes. Extend: no. Magic Missiles doesn't have a duration, being an instantaneous spell.