I suggest a cheap item (~2200 Gold) with weak stats meant for Wardens that gives you the ability to tank one spell similar to Braum's Unbreakable, omni-directional but with weak/no damage reduction, to help prevent picks on your allies. Difference to Locket is being able to absorb the effects of AoE spells (like Sejuani ult), positioning requirement, and pseudo-engage warranty similar to Banshee's Veil. Could possibly widen your hit box (indicated with a circle around champ?) to make positioning requirement easier. Low/no damage reduction prevents abuse. Stats would have to fit Wardens in some other way, too, and it could gain passive effects from component items used.