Level 10
Now we're cooking with charcoal! At level 10, Brother Chthonius makes a formidable ally or adversary. He has enough power to muscle into a dungeon and make himself indispensible. His skills and spells give him the wherewithal to start setting challenges for human and monster alike, making people start to take his claim to be an agent of fate seriously.
Brother Chthonius, male human Clr10: CR 10; Medium Humanoid (Human); HD 10d8; hp 48; Init -1 (Dex); Spd 15 ft. (armour, medium load); AC 20 (-1 Dex, +9 armour, +2 shield), touch 9, flat-footed 20; Base Atk +7; Grp +8; Atk +10 melee (1d8+2, +1 heavy mace) or +6 ranged (1d4, sling); Full Atk +10/+5 melee (1d8+2, +1 heavy mace) or +6/+1 ranged (1d4, sling); Space/Reach 5 ft./5 ft.; SA Turn undead; SQ Aura, cast divination spells at +1 caster level, good fortune 1/day, spontaneous casting; AL N; SV Fort +7, Ref +4, Will +11; Str 13, Dex 8, Con 10, Int 14, Wis 19, Cha 12.
Languages: Celestial, Common, Goblin.
Skills and Feats: Concentration +13, Heal +17, Knowledge (architecture and engineering, arcana, dungeoneering, nature, religion) +7, Knowledge (the planes) +3, Spellcraft +17, Search +2 (+4 secret doors), Survival +4 (+6 underground, +6 aboveground); Combat Casting, Extra Turning, Lightning Reflexes, Scribe Scroll, Weapon Focus (heavy mace).
Cleric Spells Prepared (6/6/6/5/5/3, base DC = 14 + spell level): 0-create water, detect magic, guidance, light, mending, read magic; 1st-comprehend languages, detect secret doors*, detect undead, divine favour, hide from undead, shield of faith; 2nd-augury, detect thoughts*, find traps, make whole, owl's wisdom, silence; 3rd-create food and water, dispel magic, meld into stone, protection from energy*, stone shape; 4th-death ward, divination*, divine power, greater magic weapon, tongues; 5th-break enchantment*, flame strike, scrying.
* Domain spell. Domains: Knowledge, Luck.
Possessions: +1 heavy mace, sling, 20 alchemical silver sling bullets, +1 full plate, heavy wooden shield, periapt of Wisdom +2, 2 scrolls of bless water [5th-level caster], 2 scrolls of cure critical wounds [10th-level caster], 4 scrolls of cure light wounds [5th-level caster], 2 scrolls of dispel magic [10th-level caster], 2 scrolls of greater magic weapon [10th-level caster], scroll of mass cure light wounds [10th-level caster], scroll of wall of stone [10th-level caster], 2 scrolls of shield of faith [5th-level caster], silver holy symbol (25 gp), explorer?s outfit, backpack [cleric?s vestments, 50 ft. silk rope, 2 weeks? trail rations, waterskin], everburning torch, 2 healer?s kits, 2 flasks of holy water, 130 gp.
As before, Concentration, Heal and Spellcraft are maxed out while Knowledge skills are topped out at 5 ranks apiece. He has enough Knowledge (nature) to give him a slightly better chance of survival on the surface world. Given that he spends most of his time in the dungeon, however, it's about time for him to have Knowledge (architecture and engineering) since he should really know how the traps and secret doors work. He's just started to learn about the planes, just to bring the Survival bonuses up slightly.
As far as his feats go, I've decided to pay attention to one area in particular that has let Brother Chthonius down: combat. That low Dexterity is really beginning to make a nuisance of itself, so to offset the penalty to his Reflex saves I've given him Lightning Reflexes. Since his hand-to-hand combat could do with improvement, he now has Weapon Focus (heavy mace).
Around this time we start to see a major shift in Brother Chthonius' equipment -- at long last he has a +1 heavy mace so he doesn't have to rely on casting spells on his mace, just to get it halfway decent. He still has a couple of scrolls of greater magic weapon just to boost that up a bit when he needs to. Similarly, he now has magic armour, and about time too! Since higher Wisdom equals more spells and better saves, he'd be a fool not to get a periapt of Wisdom at this stage, so he has one of them.
By level 10, Brother Chthonius has access to one of the most important spells for a priest of the dungeons: wall of stone. The spell's perfect for him: he can partition rooms off, seal corridors, repair floors, walls and ceilings. Given enough time, he could even build his own dungeon! Depending on how serious you feel, he could be contracted out to budding overlords and conspirators. 'Oo put that pit trap there? 'Ckin cowboys. 'sgonna cost yer!
Despite its usefulness, he's still pretty limited to the amount of 5th-level spells he can have, so for the moment he'll have to make do with scrolls. It's not a perfect world.