- 20 ability power = 435
- 8 ability power = 174
- 15% cooldown reduction = 475
- is gold efficient with zero stacks (20 AP) and gold efficient with its initial 5 stacks (+60 AP). Its gold efficiency increases by per stack, becoming gold efficient after six stacks, reaching gold efficiency at maximum stacks. At 20 stacks, the soulstealer grants +180 AP. At 10 stacks, the soulstealer grants 100 AP.
- Mejai's Soulstealer is a reference to Mejai the Gypsy from the comic "Le Scorpion".
- Snowball Sister Items" that shared a stack feature based on champion kills/assists. , , and the removed were a trio of "
- At 20 stacks mana or more). provides more AP than any item except (if the wearer has at least 172 AP), and (if the wearer has 4000
- and a fully-stacked grant a total of 405 AP ((120 + 180) × 1.35)
- The stacking buff granted by when a kill or assist is scored is called "Soul Engorgement."
- and are the only items to provide 15% cooldown reduction; all other items grant 10% or 20%