4 Lists - Some complex series and its spin-off

The Ancient Land of Ys
Ys Eternal
Ys I Complete
Ys DS
Ys Chronicles 1

Ys Series

32 Games

Dragon Slayer
Romancia: Dragon Slayer Jr.
Legacy of the Wizard
Dragon Slayer Gaiden
Xanadu

Dragon Slayer Series

56 Games

Wizardry: Proving Grounds of the Mad Overlord
Wizardry: Knight of Diamonds - The Second Scenario
Wizardry: Legacy of Llylgamyn - The Third Scenario
Wizardry: The Return of Werdna - The Fourth Scenario
Wizardry V: Heart of the Maelstrom

Sir-tech Wizardry series

9 Games

Wizardry Gaiden I: Suffering of the Queen
Wizardry Gaiden II: Curse of the Ancient Emperor
Wizardry Gaiden III: Scripture of the Dark
Wizardry Gaiden IV: Throb of the Demon's Heart
Wizardry Dimguil

Wizardry spin-off

22 Games