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Dota 2 now has a new endgame item called the Octarine Core, formed from Mystic Staff and Soul Booster. According to the patch notes, it provides an impressive boost to Intelligence, HP, Mana, HP regeneration and Mana regeneration, and includes a passive reduction of 25 per cent on all cooldowns, as well as a passive Spell Lifesteal. It's pretty powerful for all mage type heroes.
Discworld fans will know octarine as the colour of magic in Pratchett's fantasy universe. The Colour of Magic is the name of the first Discworld novel, released in 1983. Here's a quote from it:
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