Cheiromancer
Adventurer
Eyeballing the CR numbers, it looks like the Bebilith should have been a pretty tough but not quite overwhelming encounter. He has revised the bebilith to be CR 14 in v5 of his PDF, but let's use 13.
Let's see (looks up various tables)- a CR 13 is an EL 15 encounter according to UK, and 5 7th level characters is an EL 17, so this is an EL-2 encounter; a tough encounter, which should use about 50% of the party's resources.
My variant of UK's system (the "CHI-RHO system") is just to square the CRs of the monsters, and compare it to the sum of the squares of the characters' ECLs. Via various mathematical contortions, it ends up being quite close to UK's method.
So the Bebilith's power is 13 * 13 = 169
And the players power is 8 * 8 * 5 = 320
(Or thereabouts- the actual levels should be used, not the average level. I am adding +1 to each of the player's levels, because of the elite ability scores)
169/320 = 53%, compared to the 50% that UK's method will give.
If you use CR 14, UK will say it is an EL-1 encounter, say 75% of party's resources used, while my method would say a CR 14 encounter is 196/320 = 61%. So tough, with a real risk that the party would get mauled, but not overwhelming.
Let's see (looks up various tables)- a CR 13 is an EL 15 encounter according to UK, and 5 7th level characters is an EL 17, so this is an EL-2 encounter; a tough encounter, which should use about 50% of the party's resources.
My variant of UK's system (the "CHI-RHO system") is just to square the CRs of the monsters, and compare it to the sum of the squares of the characters' ECLs. Via various mathematical contortions, it ends up being quite close to UK's method.
So the Bebilith's power is 13 * 13 = 169
And the players power is 8 * 8 * 5 = 320
(Or thereabouts- the actual levels should be used, not the average level. I am adding +1 to each of the player's levels, because of the elite ability scores)
169/320 = 53%, compared to the 50% that UK's method will give.
If you use CR 14, UK will say it is an EL-1 encounter, say 75% of party's resources used, while my method would say a CR 14 encounter is 196/320 = 61%. So tough, with a real risk that the party would get mauled, but not overwhelming.


