What happens if I dragon form a token to make it 5 might then attached a shady Spectacles and make it 10 might. How much might does it have. What of then salvage kills the Spectacles. How much might then

10 Might while Spectacles is attached, then 5 Might after Salvage kills it.

Shady Spectacles' copy effect makes the token a copy of the chosen friendly unit, and a copy takes that unit's base Might (Rule 477.1.b.1). While the copy is active it applies in Layer 1 after Dragon Form's "base Might becomes 5" assignment, so the token reads 10.

When Salvage kills the Spectacles, the gear detaches and the copy effect ends. The token reverts to its own traits, but Dragon Form's effect is still active "this turn," so it's back to 5. Once the turn ends and Dragon Form expires, it drops to the token's printed Might (e.g., 1 for a Recruit token).