Dragons lair 
To open the Dragons lair organize a party with members that are all at 
least level 14. 

Immortal Characters 
To create immortal characters (no aging): 

1. Create a character and age him/her until the first year they turn ''old''. 
Fighter/Wiz=60, Dwarf=100, Elf=200. 

2. Take the character out to battle and have him/her die. 

3. Let the character remain dead for 20 years. 

4. Take them to town and have the magician revive them. There should only be 
10% chance. If it's not 10% you may have done something incorrectly. 

5. If the resurrect is successful, you should now have an immortal character. 
Just use rejuvenate to get them to the desired age.