New Abyssal Scepter Sucks
They are turning it from a strong early and late game item that synergizes extremely well with assassins because of the flat penetration it offers, and Thornmail for tanks because the synergy.
Now, the item is a shitty early game item (who the fuck rushes % based penetration?) that offers very little AP. The item is now a mid-late game item made for tanks... because who the hell else is going to make use of the horrid stats it offers and 4 second pulse?
Please Riot, either leave Abyssal the way it is... its fine the way it is... or implement your shitty tank-loving item as it own separate item.