The best replacement for warmogs is guardian angel.

The best alternatives to warmogs are rated as following:
★★★★★  guardian angel
★★★★  randuin's
★★★★  spirit visage
★★★★  ga
★★★  sunfire
★★  sunfire cape
★★  randuins
★★  leviathan
★★  force of nature
★  mallet
★  frozen mallet

Your alternative for warmogs is not listed? Suggest!
Speaking about warmogs, one probably shouldn't forget about vladimir.

Other search terms related to warmogs and their ratings are:
★★★★★ vladimir
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warmogs
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