So right now we have:
Arcane - Wizards Tower
Dark - Drain Life/Soul
FM - Forcefield, Charm
Holy - Divine Intervention
But the War and Nature schools lack any similarly awesome spell. (Akiro's is too late game to count) BMs are fairly strong but Warlord needs the help.
What about:
BM - can feel vulnerable to early rushes, especially Jokhtari. So he needs a defensive spell, how about the equivalent of "Fog":
Dense Mists, Quick Incantation, 0-1 Zone, 5 Mana, Level 2 Nature
Until end of round, No attacks may be declared to or from objects in this zone.
Warlord - he needs a way to reach enemies that are dancing around at range, especially when he is enfeebled or held. (Hard for him to dispel) I think a Mortal Kombat style Scorpion harpoon would be great.
Bloodwave Harpoon, Quick Attack, 0-2, 8 Mana, Level 2 War
5 dice, 1-7 Pull, 8+ 2 Pull
Target is pulled one or two zones toward the caster, depending on effect dice roll. This may not Pull a target through Passage Attacks. If Bloodwave Harpoon rolls effect dice against an Unmovable target, caster may choose to Pull himself toward the target instead.