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We are aware of the recent Heartbleed Bug internet vulnerability issue and can confirm that none of the KingsIsle systems or websites were impacted. If you wish to have further clarification about the bug itself visit http://heartbleed.com.
Apart from treasure cards, unicorn is available to life wizards only, and is the reward for the class quest offered at level 7. It heals all group members for 275 health, but at a cost of 3 pips, making it rather inefficient unless at least three players in your group need a heal.