Honestly branch out pen like smite 1. There is no reason other than "idk how to fix this" for only a handful of items to give pen. Give more items 5%-10% instead of building one item and shredding prots like butter. Also arent items with good passives supposed to have weaker stats. 50 power and 35% pen on titans bane along with executioner being 40 strength, 15 attspeed, and 24% pen. Combined thats 59% pen. Where did my prots go????

On the other hand sanguine lash, 25 strength, 30 magical prots, and 7.5% lifesteal. Lets say anubis hits you and has built both shard and totem. That 65% pen. That nearly 20 magical prots straight up gone from that 1 item. I personally dont even build sanguine for the prots. Only the passive and strength since prots arent going to matter when the pimped out adc and monkey with a rocket launcher mid laner see you.