A wonderful buff to Ohmwrecker. Hear me out, Riot.
Meddler posted on one of my threads regarding to Ohmwrecker explaining and deciding to rework the item once more after this season. Here is my suggestion.
I was looking at some of the items that was featured in the Black Market Brawler event. There's an item called Rite of Ruin.
Rite of Ruin: 100 ability power 100 mana regen. 20% cdr Unique passive: Razing - Gain charges upon moving or killing enemies (200 charges max). Attacking a structure expends 50 charges to deal 100 (+15% AP) bonus true damage.
Instead of the item scaling with AP, make it scale with tank stats such as health, magic resist and/or armor.
Or maybe turn Ohmwrecker back into and AP item like it was and apply the passive from Rite of Ruins.
It fits with the sieging theme of the item and gives it more use. That way you can siege by attacking the turret and if a teamfight occurs around the turret, you can use the active.