Why didn't the author mention the new types of creatures?

I thought you were already familiar with this map and the creatures. 1) Rune Lords (level 5 creature) Attack 10 Defense 9 Damage 9-13 Speed 3 Initiative 10 Hit Points 65 Ranged Attack 7 Abilities: Living creature. Ranged attacker. Ranged attack without penalty. Immune to Earth. Sorcerer. Spellbook (12 mana): 2) Balrogs (level 8 creature) Attack 45 Defense 32 Damage 70-95 Speed 8 Initiative 13 Hit Points 1300 Abilities: Elemental. Immune to Fire. Ethereal. Strike and Return. Whip Attack. Large creature. Storm Strike. Magic Strike. 25% Magic Resistance. Sincerely, Psixxx.