Psions duplicate way too fast. So much in fact that Warmind cells disappear upon hitting the ground and Not being able to find a respawn point. Please bring the Psions in check cause thats ridiculous.
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There are some crowd control tools that work wonders against them. Necrotic Grip, Dunemarchers, Arc Web and Lucky Raspberry, for example.
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Trinity Ghoul. Riskrunner. Dunemarchers. Though they have gone berserk there are ways to deal with them :)