Conversation so far:
What was Legion Quest?
CANNOTANSWER.
Are there any other interesting aspects about this article?
Mystique tracked down David years later to get revenge for "his" murder of Destiny.
What happened after Mystique tracked down David?
he awakened with his fractured mind healed.
David had a new goal.
What was his new goal after he awakened?
help his father realize his dream of human-mutant coexistence by killing Magneto, Xavier's greatest opponent, before he had a chance to amass power.

Question: How was he going to kill Magneto?
Self-contained rewrite: How was David going to kill Magneto?