Forbearance here is letting everyone use arguably the best PvE special weapon in the game before it gets nerfed in TFS, so I don't mind that it's a) a Raid weapon, and b) still currently available. Succession makes absolutely no sense though; Snipers aren't really "in" right now, it's not flashy enough to make people want to start Raiding for other weapons and The Supremacy is already available to non-Raiders through Riven's Wishes. That slot could have been used on many better options.
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You could also make the argument that ITL's Forbearance is still objectively worse than the original because it lacks Souldrinker.
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It depends how effective the new Origin Trait is. Given the precedent of Classy Contender being 5% per kill, and Demolitionist and Pugilist having reduced gains on GLs, you would expect it to be 5% at most. However, given that the theme of these weapons is "best items ever, go a little crazy", you never know.
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Considering grenade and melee abilities are more potent than class abilities, I'd imagine it'd probably be about 3% per kill.