There should be a vampiric sceptre upgrade that restores mana and builds in to essence reaver

why? more like why not.

vamp scepter+longsword+gold = essence blade, 25 attack damage, 10% lifesteal, unique passive: basic attack restore 5 mana over 3 seconds, OR killing a unit restores 3 mana.

this is the only build path unless riot makes a 5% cdr item.

hook it up please.

Edit: It would seem clear from the replies that the main issue with this is overpowering certain champs laning phase, and it is being compared to tear/muramana.

if we're talking about the item riot was considering but never put it in the rift; http://leagueoflegends.wikia.com/wiki/Soul_Sickle

then yes I would agree it's too powerful because even with just this item, a player would mostly likely have around 100 ad at that point, and as a result would be restoring 1-6 mana per basic attack, with every additional point of ad the player adds this amount would increase by roughly 1%, and with crit/on hit's it get's increased by 2-3+%.

which means a player could sit on this 1400g item and it's value would continue to scale with other items, restoring something like 50-80 mana per hit later game without completing essence reaver, this is just too strong BUT.

that's why I suggested an item with flat mana regen on hit, so it's value stays the same and it's power is capped until it is upgraded into essence reaver.

still, maybe 25 ad is a bit high, so i guess another build path could include a vamp sceptre+faerie charm instead of longsword, and the final items could have 15 ad, 10% lifesteal, and restore 5 mana over 3 seconds on hit or 3 mana per unit killed.

another idea (which contradicts the title of my post, but accomplishes the same goal) would be to make forbidden idol build into an ad item; idol+longsword+240gold = forbidden sword with 15 ad, 10%, and restores flat mana on hit or unit killed. forbidden sword+vamp sceptre+pickaxe=essence reaver.

comparing this flat mana regen to tear is kind of hard because tear gives much more mana sustain+permanent max mana, has a lower cost, and offers a unique mechanic once manamune/muramana is complete.

I don't think having ER build from forbidden idol is the correct answer unless it built into an early ad/mana sustain item in place of the vamp sceptre/lifeseteal, the mana regen and cdr is just not good enough for an ad champ to sit on while they complete higher priority items like ie/lw.

p.s. 5 mana over 3 seconds on hit or 3 mana on unit killed is actually really low if you compare it to a dorans ring which basically doubles that, so maybe this item could use more, lets say 6 or 7 mana over 3 seconds on hit, or 4 mana on unit killed.

thanks for your consideration.