I'm looking into adding mythic ranks to some monsters that don't already have Mythic conversions done for me. To that end, I'm trying to deconstruct some of the existing conversions to get a better understanding of the process. I'm currently looking at the Mythic Nalfeshnee, since it's similar in power and concept to the monsters I'm converting (similarly CRed evil outsiders).
Now the table tells me, when I give a monster 7 mythic ranks, as with the Nalfeshnee, it gets 8 mythic abilities (MR+1). I'm having trouble accounting for them all on the Nalfeshnee. Two are called out--Demonic Knowledge and Touch of Chaos. It also appears to have gained Fast Healing, the ability to make a Steal maneuver when it hits with its claws, and it appears that adding its tier to initiative would fall into this category, as not all Mythic monsters share that trait. That still leaves three abilities unaccounted for. Do several of these count as two?
Let's see.. By comparing to the regular Nalfeshneee, the Mythic Nalfeshnee has gained: fast healing, immunity to fire, steal, demonic knowledge, touch of chaos, constant detect thoughts, at will move earth, at will stone shape, at will stone tell, 3/day scrying, 1/day contact other plane, +8 STR, and +4 CHA.
The initiative bonus is due to its Mythic Initiative feat, and +6 of the ability score bonuses are due to the regular ability score bonuses granted to mythic monsters, but I suspect those other abilities will be sufficient to account for the 8 mythic abilities (I haven't gone through all of the available abilities to check).
Let's see--I'd guess Move Earth, Stone Shape, and Stone Tell would all be under one ability, united under the theme of 'power over earth'. Detect Thoughts, Scrying and Contact Other Plane might also be united under the theme of gaining knowledge. If we assume those unifications, that makes 7 abilities, with the 8th apparently being +6 to ability score--which is an odd result, since +2 to one ability score is a tier 3 universal path ability, so one would think that accounts for three mythic abilities...