I can’t accurately determine the order, so I’ll just list them, and not all of them are games:
- Everything from Blizzard...
- The BattleTech universe, absolutely everything: games, books, board games, etc.
- Zelazny’s books... they practically shaped my personality...
- Games from KD-LAB, and first among equals, Warlords.
- The card game Magic the Gathering.

P.S. It turned out that Heroes didn’t fit in, but considering that the list doesn’t only include games, I’ll add them as a postscript. Heroes 1, 2, 3, 5.