Habitica is a productivity app, something like a to-do list in a gamified form. Users gain experience and gold from completing tasks, and can join in quests with a party to defeat monsters.
The mage class has one of the highest damage in the game (after warrior), and its base stat is intelligence. The best mage gear with highest intelligence (as of June 2017) is as follows:
Armor: Jean Chalard’s Noble Tunic (+25 INT, +25 CON)
Headgear: Nameless Helm (+25 INT, +25 STR)
Shield-Hand Item: Diamond Stave (+16 INT)
Weapon: Trident of Crashing Tides (+15 INT)
For stats, put all stats into intelligence.