Infinite mobility with mana scaling; great for hunting farm. Kaya-Bloodstone-BKB.
Regardless of the hero, these three pillars define a 1x6 build: Complete Dota 1X6 Guide For Invoker Q Path dota 1x6 builds
Do not split your legendary talents across multiple abilities. A hero with a fully upgraded "Q" is almost always stronger than one with mixed upgrades. Infinite mobility with mana scaling; great for hunting farm