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In the game, each class can be upgraded once. What does this give? Firstly, the ability to learn skills at a higher level, and secondly, an increase in health points (HP) and magical power (SP). Below is a list of upgrades with comments and the corresponding HP and SP values for each rank. For the starting class, the starting health, magical power, and bonuses per level are indicated, while for the advanced classes, only the bonuses are listed.
Cleric (30, 15; 2, 3) upgrades to Priest of Light (3, 5) — can heal, destroy skeletons, magically enhance and protect the party. Very useful at low levels, especially against undead. The only one who can learn Light Magic.
Dark Elf (20, 10; 3, 2) upgrades to Dark Elf Patriarch (4, 4) — a merchant, thief, excellent archer, and a decent elemental mage; Jadame is mostly populated by dark elves — draw your own conclusions.
Dragon (40, 10; 4, 2) upgrades to Great Wyrm (7, 3) — remember, in previous games, there was a super weapon, blasters? Well, now they're gone. Instead, there are dragons. Terrifyingly powerful ranged and melee attacks, the strongest attacking magic, and the ability to carry your squad through the air. They don't use items, except for rings and amulets.
Knight (30, 0; 5, 0) transforms into Champion (8, 0) — a knight is a knight, no matter where he is. Focus on melee combat, and he's the best at it, with almost any weapon and in any armor; the only one who can repair equipment without limitations.
Minotaur (30, 5; 4, 1) becomes Minotaur Lord (6, 2) — a kind of analog to the paladin in previous games. A decent warrior, with some knowledge of clerical magic. Doesn't wear a headdress or shoes. Priority is the axe, although he is also proficient with other weapons.
Necromancer (20, 25; 2, 3) upgrades to Lich (3, 5) — a full-fledged mage. Almost indispensable in the party. A properly developed Lich is easily comparable to a dragon in terms of total damage dealt to the enemy. Many GrandMaster-level skills are only available to him; in addition, the new rank brings with it immunity to clerical spells and increases resistance to elements to 20.
Troll (45, 0; 5, 0) upgrades to War Troll (8, 0) — a large piece of meat that recovers from damage very quickly. Doesn't use magic, but is excellent with "blunt" weapons, and GM Leather is a definite plus for the troll.
Vampire (30, 20; 3, 2) transforms into Nosferatu (5, 3) — a character unlike anything seen before in Xeen. With proper use (development, skills, equipment), he is comparable to a Knight in melee combat and a Cleric in magic. Immune to Mind magic.