I'm one of the players. The campaign (in Geoff Against the Giants campaign of Greyhawk) starts at 1st level with 9 players. Now the party is 9th to 10th level with five players and we are playing Return to the Temple of Elemental Evil. The cleric human (female) of Obad-hai dies in combat (epic scene here

).
The players are with the DM

and it fits in the campaign, so no problem (a nymph cleric of obad-hai will help the party in this hard campaign).
So, how do you resolve the problem of HD and XP advancement ?
our DM has proposed:
* ignore the ECL.
* 9th level cleric + Nymph CR6 = 15th level character class
* hp: 9d8+con (cleric) + 3d6+con (nymph)
* she gains the ability mods, skills, feats, class abilities and powers of the nymph.
* she now gains XP as 15th level character (she has 41.000 XP aprox.)
* so until she reach 120.000 XP no level up (ouch !). This will let the others players equal his characters class (we gains XP as lower level classes). Our master has employed this system before because the party was not even in levels.
The players agree (me included). What is your opinion ?
