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I would like to know if I can convert monsters from other editions ( I already figured out how to convert monsters from the 1 ed) into 2ed monsters.

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The design goals behind the math of 3.x and 4e monsters are vastly different from the design goals of AD&D monster stats, enough that you'd be better off just assigning numbers as you see fit, using the 3e/4e creature only as inspiration. – SevenSidedDie Sep 10 '11 at 16:22

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up vote 8 down vote accepted

For 3.X monsters:

Keep the HP and HD as listed in 3E. Assign the THAC-0 based upon the HD. Convert spells by name; most early 3E stuff is direct from 2E.

Convert saves by feel; level should be same as HD. Combat monsters should be as fighter; spell-users as MU or Cleric. Sneaky poisoners as Thief, etc.

Assign asterisks as per the DMG guidelines.

Note: There was a conversion manual for characters from 2E to 3E. It's quite possible to work backwards with it for converting NPCs, but it's much easier to just grab the atts, and lose 1 point of stats per 4 levels, and use same class and level, assigning proficiencies by feel.

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This is pretty much what I was going to show by example; +1. – SevenSidedDie Sep 11 '11 at 0:41

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