The Hieracosphinx is a lesser Sphinx that does not have an official stat block for 5e, as via Christopher Perkins' Twitter. However, I would like to use this monster in a desert setting with Level 6 characters, for which the more powerful Gynosphinx (CR 11) and Androsphinx (CR 17) are out of question for being too powerful and not evil. In 3e, which I'm not at all familiar with, the Hieracosphinx had a CR of 5 apparently, see here, but I have no idea if I could translate the stats 1 to 1 into 5.

Another idea that I had was scaling up a Griffon (CR 2), giving it the Gynosphinx's Claw Multiattack, a bit more HP and a few spells from the spell list.

So, how do I make a Hieracosphinx for this edition? I have never designed a monster from scratch before, only adding or subtracting 1 or 2 things from existing monsters sometimes.

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    \$\begingroup\$ Have you read the DMG chapter on designing monsters? Is there anything missing that you need to know, specifically? \$\endgroup\$ – Erik Sep 26 '19 at 12:02
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    \$\begingroup\$ You mention a CR 5 monster from the previous edition, and your players are level 6. What CR are you aiming for? 5, 6, 7, 8? \$\endgroup\$ – KorvinStarmast Sep 26 '19 at 12:15
  • \$\begingroup\$ I would like to avoid the "1 powerful monster nova'd by players in the first round" scenario, so rather lower CR (5), but more than 1 sphinx, maybe 2 or 3. My first attempt would have been: large monstrosity, chaotic evil, AC 15, 135 HP, +6 to attack, Claw Multiattack with 2d8+4 slashing damage, spells from the Gynosphinx up to Level 3, with 4/3/2 slots for Level 1/2/3 spells, respectively. But the spells feel kinda "wrong" to me, as they're all support or CC type spells, while the Androsphinx's spells are spells with a "lawful good" vibe (sacred flame, zone of truth etc.). \$\endgroup\$ – John W. Sep 26 '19 at 12:33
  • \$\begingroup\$ Somewhat related: convert 3.5 enemies to 5e \$\endgroup\$ – goodguy5 Sep 26 '19 at 12:44
  • \$\begingroup\$ For what it's worth, the Hieracosphinx you linked to is from Pathfinder (1e) which while related to 3e, isn't the same. \$\endgroup\$ – Someone_Evil Sep 26 '19 at 13:44