Warlock ? Book 6 ? Hey !
Was this RPG in 6 books, with knight and barbarian in book 1, cleric and mage in book 2, and adventure in book 3, the assassin in book 4, the elementalist in book 5 and the warlock in book 6 ? In the adventures, you fought the three shards of an elven crystal (in a forest, an island, and another plane with Fenris making you run away), and then prevent the evil god Balor from reawakening ?
If that's it, I just found the original name of my first RPG ever: "Terres de Légendes", translation of an american game, published in the same collection as these gamebooks (you know, the "Steve Jackson & Yan Livingstone present: Deathtrap Dungeon"-style books).
If we're indeed talking of the same thing, yes, it was very good for beginners. The warlock was renamed "seigneur de guerre" (warlord), however. And boy they were munchkins ! They had a sort of ray spell that lowered the magic defense of the creature it hits. Combined with the Banishment spell that was resisted with magic defense and that, if successful, permanently removed a creature from the world, never to be brought back again, the warlock of the party was confident he could even go on killing Fenris. [/B]