The best replacement for fallen is fell.

The best alternatives to fallen are rated as following:
★★★★★  fell
★★★★  hush hush
★★★  falling
★★  optimus prime
★★  megatron
★★  lakai
★★  white house down
★★  sentinel prime
★  evanescence
★  open door
★  oblivion
★  emerica
★  prime
★  terminator salvation
★  hush hus
★  optimus
  my name is memory
  nike sb
  i have fell
  purified lunar dust

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hush hush