I suppose farming Labyrinth of the Ancients is the way to go, when you finish up the questline. Gives 200 Tomestones of Phil. and 50 Tomestones of Myth. each run, and since there are 5 other tanks, you most likely dont have to be maintank so doesnt require super gear.

Also doing Main Scenario roulette once a day is good way to earn Phil. tokens, 300 with the daily bonus.

Gear comes from NPC's in Mor Dhona, Philos used for i70 gear, myths for i90. Also Labyrinth drops some i80 gear, though one loot / week.

Coils drops also i90 gear but there u want at least full philo. set, more the better.