Ability power, sell-back value decreased.
Dark Seal is meant to be a greedy purchase to eventually upgrade into an even greedier Soulstealer, but its stat efficiency is so high and its sell-back value so good it’s become the correct choice to buy (sometimes in multiples) in too many situations.
ABILITY POWER :  ⇒ 10
SELLBACK VALUE :  ⇒ 140 gold
The Dark Seal
Cheaper cost so you can start with a refillable potion or three health potions.
The Dark Seal was designed to be a 'limited window of power' fantasy, so we're going a little harder on that. Now the dream start is a Dark Seal + Refillable Potion, where you get first blood for some stacks and an early Corrupting Potion (and that feel-good item synergy), play arrogantly, lose all of your stacks on a failed gank, stubbornly refuse to sell your Dark Seal (even though it's like selling a Doran's Ring), double down on Mejai's, and never get past 5 stacks.
I'm not projecting, I swear.
COST : [400 gold] ⇒ 350 gold
SOULS AIN'T CHEAP : The total price of Mejai's Soulstealer is unchanged
Alternative starting item to Doran's Ring. Builds into Mejai's. Is dark. Is a seal.
Doran's Ring has always been the go-to starting item for mages, but offers more in the way of lane safety than offensive potential. The Dark Seal trades defense for all-in power, presenting an aggressive option for champs who want to roam and make plays to start a match off strong. Fail to snowball? No sweat, just sell it off like you would your Doran's and proceed as normal. Get a few early fights in your favor? Go for glory and start stealing some souls.
TOTAL cost : 400 gold
ABILITY power : 15
mana : 100
BONUS HEALING FROM POTIONS : 25%
new UNIQUE passive : Do or Die: Grants 2 Glory per champion kill or 1 Glory per assist, up to 10 Glory total. Upon dying, you lose 4 stacks of Glory.
new UNIQUE passive : Dread: Grants 3 ability power per Glory