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Basically get out the Shard early so it defrosts and buffs your worms.
Worm active is useful even when they're not attacking, and the +|+ stacks.
Some very limited CC against 1-health creatures (or 2-health if you get off a Dry Spell before worm-ing them)... but Dry Spell isn't that useful given how every enemy is burrowed very quickly. Hmm. maybe Tunneling instead of one of them.
