Level 40 seems quite a long time to wait, especially on medium. While he could certainly wait a bit, I think his biggest problem is a lack of damage. Shaman, Archmages, and Inquisitors have nice utility but crap damage. Green dragons are tough but crap damage. Paladins have utility and are fairly tough but below average damage.
What units you choose depend a lot on what skills/spells/items are available to you and how you want to play so it's hard to make specific recommendations. But a no brainer in my opinion would be to swap the shamans out for a damage dealer. Royal snakes perhaps, good damage and no retaliation, not terribly fragile (very tough vs. poison). Lake or forest fairies maybe, excellent damage (absurdly so with assasin's dagger), no retaliation, fast flyers, very fragile however.
Try swapping the dragons with royal griffins. Phantom them and have the stacks of angelic guards attack the boss while the original griffins help clear the summoned spiders.
Hell, if you go with lake fairies, forest fairies, and royal snakes, you might be able to hurt the boss so quickly he doesn't have time to summon spiders. I don't recall how much leadership you need for that though.
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