Octarine Core

The Octarine Core is an item purchasable at the Secret Shop, under Caster. However, it can only be completed with items from the Secret Shop.

Additional information
One Octarine Core grants a total of 450 health, 4 health regeneration, 725 mana and 1 (+ 100%) mana regeneration (and 25 attack damage to intelligence heroes).

Spell Lifesteal mechanics
The following abilities can lifesteal with Spell Lifesteal

1 The instantly killing effect of these spells also triggers Spell Lifesteal, healing based on the killed unit's remaining health.

2 Despite these spells using separate units to apply their effects, the damage sources of those are set on the caster, so Spell Lifesteal procs and heals.

3 The rum wear-off health loss does not proc Spell Lifesteal.

4 Techies still dies.

5 Does not lifesteal off of the area health cost. Only steals life when targeting an enemy to damage it.

The following abilities do not lifesteal with Spell Lifesteal

Trivia

 * Octarine is a fictional color in the comic fantasy book series Discworld, written by the late Terry Pratchett, who died just before Octarine Core was released. The color is described as "resembling a flourescent greenish-yellow purple" and can only be seen by wizards and cats.
 * The components of Octarine Core are the same as the components of the pre-6.60.