As of right now, the spear feels like a weaker GS/Sword, with lower damage and the same conditions (chill and vulnerability mostly). Have you considered adding the SLOW condition? Necromancers currently have the worst access to SLOW among all professions which doesn't make sense anyway considering how slow they are. So if you give SLOW to spear, it will make it stand out among the rest necromancer's weapons. Maybe, after reaching a certain soul shard threshold, the spear's #4 toggle ability consumes soulshards to inflict SLOW on the opponent after teleporting.
Summary:
Greatsword: Chill, Vulnerability, Blind, Boon corrupts, and Pull (CC).
Sword/Sword: Chill, Vulnerability, Weakness, Boon Corrupts, Fear(CC)
Spear: Chill, Vulnerability, [Add SLOW instead of Blind and Weakness], Boon removal + Unique Debuff, Immobilize + stun (CC)