Mind your mana pool for the spiders. Also, from personal experience, 1 in 4 seems to be highly resistant to spells in general so rounding them up and getting them snared is a bit of a mana drain, even before resists from your pillars go off.
And you'll need to jboots/strafe OR SoW to get them snared. They're fast. Suits are the easy way to go.
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