Idea for a very situational item

If there's no True damage champ on the enemy team, then it could still be used to counter jungle..

Name Pending Cost 500g. Active: Grants a shield to target ally or Epic monster, blocking 25+(10 x champion level) True damage for 2 seconds. Does absolutely nothing else and does not block other types of damage, or Pure damage. Additionally scales 100 x the number of utility items purchased. These include . This means that the maximum shield would be 705 True damage (at level 18, with no boots and nothing but utility items.) So realistically, since you're going to buy a gold income item and boots, it'll be 505 at the most. It'll block half of a level 18 Smite and most of a Darius ultimate.

120 second cooldown. Halved if True damage is successfully blocked.

#You could buy it on a jungler very early, if your opponent is going Devourer and you need to prevent them from getting the 5 Dragon stacks more reliably, then sell it later. You could buy it on a support if the enemies have Vayne, Cho'gath, Darius, or Garen. (and later, you have a better chance of stealing the enemy's Baron attempt if it's just you or just you and the jungler)

This is meant to be a very extreme case of a situational item. Since it doesn't give any additional stats, you'd be relying solely on the active to make up for the locked item slot.