TrinityCore/TrinityCore — pull request #11875 by NorthStrider (2014-04-12 12:15:23+00:00)
Title: Core/Spells: define SPELL_ATTR3_UNK13

This Attribute is suposed to prevent channeled spells and auras getting canceled when another spells gets castes. Used in World of Flames (100171) for example.