The best replacement for agony is bane of doom.

The best alternatives to agony are rated as following:
★★★★★  bane of doom
★★★★  barrage
★★★★  curse of elements
★★★  warmonger
★★★  spate
★  curse of the elements
★  doom
★  curse of doom
★  shredder
  curse of shadows

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Speaking about agony, one probably shouldn't forget about whitfield crane.

Other search terms related to agony and their ratings are:
★★★★★ whitfield crane
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agony
bane of doom
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