Immortality

Table 3: 3rd Edition to 4th Edition Conversions
3rd Edition		4th Edition
Level/ECL	CR	Minion	Standard	Elite	Solo
21-22	14	29	21	17	12
23-24	15-16	30	22	18	13
25-26	17	31	23	19	14
27-28	18-19	32	24	20	15
29-30	20	33	25	21	16
31-32	21	34	26	22	17
33-34	22-23	35	27	23	18
35-36	24	36	28	24	19
37-38	25	37	29	25	20
39-40	26	38	30	26	21
41-44	27-29	39	31	27	22
45-48	30-32	40	32	28	23
49-52	33-34	41	33	29	24
53-56	35-37	42	34	30	25
57-60	38-40	43	35	31	26
61-64	41-42	44	36	32	27
65-68	43-45	45	37	33	28
69-72	46-48	46	38	34	29
73-76	49-50	47	39	35	30
77-80	51-53	48	40	36	31
81-96	54-64	49	41	37	32
97-112	65-74	50	42	38	33
113-128	75-85	51	43	39	34
129-144	86-96	52	44	40	35
145-160	97-106	53	45	41	36
161-176	107-117	54	46	42	37
177-192	118-128	55	47	43	38
193-208	129-138	56	48	44	39
209-224	139-149	57	49	45	40
225-240	150-160	58	50	46	41
241-288	161-192	59	51	47	42
289-336	193-224	60	52	48	43
337-384	225-256	61	53	49	44
385-432	257-288	62	54	50	45
433-480	289-320	63	55	51	46
481-512	321-341	64	56	52	47
513-544	342-362	65	57	53	48
545-576	363-384	66	58	54	49
577-608	385-405	67	59	55	50
609-640	406-426	68	60	56	51
641-768	427-512	69	61	57	52
769-896	513-597	70	62	58	53
897-1024	598-682	71	63	59	54
1025-1152	683-768	72	64	60	55
1153-1280	769-853	73	65	61	56

Converting the Elder Evils

Base Conversion (Direct from the Table)

Atropus = Level 18 Solo Brute
Father Llymic = Level 15 Solo Brute
Hulks of Zoretha = Level 22 Soldiers
Aspect of Leviathan = Level 13 Solo Brute
Mind Shard of Pandorym = Level 20 Solo Controller
Ragnorra = Level 15 Solo Lurker
Aspect of Sertrous = Level 18 Solo Artillery
Kyuss = Level 16 Solo Soldier
Zargon = Level 15 Solo Brute

Okay, at this juncture we are looking at a bunch of Paragon Tier wannabe Elder Evils. But a few things of note. A number of them are Aspects (Leviathan, Sertrous), while a few others are incomplete or lesser versions of their true selves (Atropus, Pandorym) even though its not mentioned within their names. We also have a few more hnts at their true power - we know Kyuss is a Demigod and that Zargon battled with Asmodeus.

Examining the goals of each Elder Evil we can better get a grasp on its inferred power.

Goals of the Elder Evils...

Atropus = Destroy all life
Father Llymic = Usher in a new ice age
Hulks of Zoretha = Destroy all (Non-Zorethan) life, the vanguard of an invasion.
Leviathan = Monster of Legend, possible goal to destroy Canaanite Pantheon of Gods.
Mind Shard of Pandorym = Re-unite mind with body, kill all the gods.
Ragnorra = Remake the world in her image.
Sertrous = Swell the power of the Yuan-ti.
Kyuss = Usher in the Age of Worms
Zargon = Conquer the world, destroy/subjugate the devils.

My own theory on Aspects, Avatars and Exarchs is that an Aspect is 20 levels loewr than the true form, while the Avatar is 10 levels lower. Exarchs are sort of surrogate Avatars. Note that (as seen in the above table), something that is a 20 level lower solo monster would only be a 3 level lower minion, or an 11 level lower standard monster or a 15 level lower elite monster.

As such we can perhaps piece together the following:

Avatar of Atropus = Level 33 Solo Brute...the real Atropus is the Moonlet.
Father Llymic = Level 30 Solo Brute...puts him in the Demigod range which seems appropriate.
Hulks of Zoretha = (5) Level 28 Elite Soldiers...I increased their levels by 10 just to make them a true world threat.
(True) Leviathan = Level 33 Solo Brute...almost puts it in the sort of Cosmic Afterbirth category potentially of the Canaanite Pantheon, though I do find Lotan a bit more interesting.
Pandorym = Level 40 Solo Controller...difficult to get a handle on this entity, but I think placing the being in the upper Greater God bracket is appropriate. That puts it just shy of the imprisoned Elder Ones.
Ragnorra = Level 35 Solo Lurker...evil Avatar of Mother Earth?
Sertrous = Level 33 Solo Artillery...Sertrous may be a threat to even Demon Princes if he arises, but his write-up doesn't put him into a sort of Greater Power category, so I reduced him by 5 levels.
Kyuss = Level 31 Solo Soldier...I tweaked Kyuss by 5 levels to get him into the Demigod range (27-31 for Solo Monsters).
Zargon = Level 35 Solo Brute...wait until you see my Asmodeus* in Gods & Monsters. ;-)

*Who may go by the name Aeshma-Deva.