You know that one meme that says “You can’t get backstabbed if you backstab first?” That sums up Clan Sputix in their only contribution to Skaven lore.
An anecdote in the 2019 Skaven Battletome details how Pestilens Clan Sputix and Skryre Clan Ekkit joined forces to clear out a Greenskin infestation. Plague Priest Skrokk was expecting betrayal from those crazed cog-snouts, so he hired some Eshin Clan Gutter Runners to sabotage Ekkit’s Warp Lightening Cannons. Inevitably when the shock guns were turned towards the Plague Monks, bombs of corrosive smog went off and reduced Clan Ekkit to slime.
Whether or not Clan Sputix survived the subsequent brawl with the Greenskins is unknown. But what can be agreed is that the only real winners of the fight are those Gutter Runners.