Cleric

Key 2
Stat Bonus Wisdom +10
Ability Able to cast general and cleric spells
The two Magic-using classes are interesting, because Magic only works in dungeons and towers, and strictly speaking you don't ever have to Enter dungeons or towers to beat the game. That said, they can be an excellent source of treasure, and Clerics are the absolute best class for delving dungeons. The only real downside to Clerics is that their bonus Stat is apparently useless.

Aside from the basic utility Spells, Clerics have two more dungeon-specific Spells of no small power: Passwall lets you just remove walls willy-nilly which, if you have a map, can make short work of a lot of dungeon levels. The Surface Spell is very nice as well, taking you from the Tri-Lithium on level 15 all the way to the dungeon exit immediately. Even using Down Ladder in a tower would cost you more than doing that.

Prayer is an interesting Spell since it will kill any opponent, but its hit rate is totally unpredictable. It's cheaper than a Wizard's attack Spells, though, and arguably the best offensive Spell in the game for that reason.
Compare Cleric to other Types
Spells: Usable by Cleric – 6 shown
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Cleric and wizard spells are exclusive to each of those classes
Name		 Key
General spells can be purchased and used by both clerics and wizards; fighters and thieves cannot buy or cast any spells
Spell Type		 Effect
The maximum price of five of this spell when purchased in a shop; if the sum of your charisma and intelligence scores is high enough, this price may be reduced to one of two lower prices; these prices can be seen by hovering over the listed price
Price Per 5
Light 1 General Same as Ignite (does not require a torch) 20 gold
Down Ladder 2 General Transport the character to the same spot on the next lower floor if the square behind your destination is open 32 gold
Up Ladder 3 General Transport the character to the same spot on the next higher floor if the square behind your destination is open 52 gold
Passwall 4 Cleric Remove the wall immediately in front of you (doesn't work on outer edge walls) 84 gold
Surface 5 Cleric Immediately exit the current dungeon or tower 136 gold
Prayer 6 Cleric 50% chance to destroy the enemy in front of you 220 gold
Fighter Wizard

Related

Cleric

Key b
Special Ability
Spells never fail
Stat Bonus
Wisdom +10

Cleric

Number 2
Special Ability
Spells never fail
Stat Bonus
Wisdom +10

Cleric

Key C
Sprite Cleric
Spell Type Cleric
Max MP Full Wis
MP Regeneration Rate ×1
Steal/Disarm None
Clerics aren't terribly flashy, but they're good at what they do. They have exclusive access to resurrection Spells, making them very useful to have in the party. They can even use halfway decent Armour, although in the long run they'll use Exotic Armour like everyone else. Their Weapon selection is poor, but they aren't totally vulnerable in combat.

Bobbits make the best Clerics because they can have such a huge MP total, and at the cost of only Dex. If you want to focus on combat, Dwarves are your best bet. Just don't make en Elf Cleric.