According to the grimiore, Psions are not related to the large cabal in any way. the Cabal are huge as we all know(800-3000 pounds) so they would have no chance in competing against a hunter or warlock in terms of agility and striking speed.
So, why not create a small nimble weapon to counter a faster threat? Why not include some of the abilities that thoes nimble treats use such as Blades edge and warlock melee?
im not saying titans are slow(physically at least).
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Titans are the fastest class, we can skate and cover distances way faster than people with blink
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psions are mercenaries that have been with the cabal so long that the cabal cannot function correctly without them
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If they are, they are doing a shitty job.
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Psions are a previously conquered race that was enslaved by the cabal.