Threadlings spam in PvP is mindless and annoying. This play style shouldn't exist in PvP.
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Just go with the flow.. my most successful build has been Strand Titan with Immortal and Le Monarque/Jotuun. It's got to the stage where unless you're pretty good PVP player already (I'm not, I'm a PVE main), you have to do whatever you can to keep up.