Lich

Basic Strategy

 * Spamming Frost Blast and Sacrifice early game can be extremely effective by harassing and denying efficiently.

Trivia

 * Lich's voice actor, Gary Schwartz, also voiced the Heavy and Demoman classes in Team Fortress 2, another title by Valve. Lich's lines, "UM NUM NUM" and "I'll put his soul to use" refer to lines said by the Heavy class in Team Fortress 2: the first is an alternate to "OM NOM NOM", used when the Sandvich Edible Device is consumed; and the latter refers, in pronounciation, to the voice command "Put dispenser here" (due to Heavy's accent, this line sounds like "Pootis penser here"), which gained notoriety after players started to spam the voice command.
 * In the transition from DotA to Dota 2, three of Lich's skills have had their name changed. Frost Blast used to be called Frost Nova, Ice Armor used to be called Frost Armor and Sacrifice used to be called Dark Ritual.
 * Lich's original name was Kel'Thuzad, a reference to the character from the Warcraft universe.