Detail
Gnome Eureka! details: most outlets say 'reduced cost + 10% damage/healing on next 3 spells'; Icy Veins warlock page says 50% mana cost, 2-min CD. Sources: https://www.warcrafttavern.com/forever/news/all-racial-abilities-in-world-of-warcraft-forever/, https://www.icy-veins.com/wow-forever/warlock-class-overview