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Here is a list of all the Temple of Elemental Evil recruitable NPCs, sorted by area location, then by alphabetical order. Let us know if there's anyone we're missing, or if any of the information needs corrections.
The Village of Hommlet
Name: Burne
Class: Wizard
Level: 8th
Location: Guard Tower, #28 on the Hommlet map
Notes: will not join until you've found the Temple. Sells nice spells
Name: Cavanaugh
Class: Fighter
Level: 1st
Location: outside the Inn of the Welcome Wench in the day
Notes: you must first Intimidate him into paying his dues during the Zealotry quest. See the Zealotry quest for details
Name: Elmo
Class: Fighter
Level: 4th
Location: Inn of the Welcome Wench at night, Main Street in the day
Notes: brother to Otis the smithy in Nulb
Name: Fruella
Class: Fighter
Level: 3rd
Location: Holten & Fruella's house, #25 on the Hommlet map
Notes: a male of your party must marry her, as part of a quest. Will not leave your party willingly
Name: Furnok
Class: Rogue
Level: 4th
Location: Inn of the Welcome Wench, downstairs
Notes: also has a part in the Innkeeper's quest. Comes with a Ring of Invisibility and Dagger +1
Name: Kobort
Class: Barbarian
Level: 2nd
Location: Inn of the Welcome Wench, downstairs, next to Turuko
Notes: only joins with 4 or less in party, and only with Kobort. Also joins in the drinking contest at night
Name: Meleny
Class: Druid
Level: 1st
Location: Filliken's house, #4 on the Hommlet map
Notes: must complete several quests in order to get her, and then marry her. Receive a Holy Longsword +1 for marrying her from Filliken. See the Flirting with Disaster quest for details.
Name: Rainol
Class: Fighter
Level: 1st
Location: Trading Post, #12 on the Hommlet map
Notes: must be hired from the traders, and has lousy stats
Name: Rufus
Class: Fighter
Level: 6th
Location: Guard Tower, #28 on the Hommlet map
Notes: will join after you discover the location of the Temple
Name: Spugnoir
Class: Wizard
Level: 2nd
Location: Inn of the Welcome Wench, downstairs
Notes: gives some locations on World Map, only loots scrolls
Name: Turuko
Class: Monk
Level: 3rd
Location: Inn of the Welcome Wench, downstairs, next to Kobort
Notes: only joins with 4 or less in party, and only with Kobort as a team
Name: Zert
Class: Fighter
Level: 2nd
Location: Inn of the Welcome Wench, upstairs, only at night
Notes: Zert has a tendency to turn on your party at the most inopportune times. The original module states that Zert is a traitor... however, with everyone else attacking at the same time he does, you might do well to avoid him.
The Ruins of the Moathouse Dungeon
Name: Lareth the Beautiful
Class: Cleric (of Lloth)
Level: 5th
Location: Moathouse Dungeon, #14 on the dungeon map
Notes: Lareth is the master of the moathouse dungeon. Will mark the Temple on your world map, and turn on you once you reach it.
The Village of Nulb
Name: Bertram
Class: Fighter
Level: 1st
Location: on the walkway, at #10 on the Nulb map
Notes: what to say, he's as straight as they come. Related to the A Pirate's Life quest, you can buy or fight for his freedom at the Boatmens' Tavern in Nulb. Talk to him using a male character. See the A Pirate's Life quest for details
Name: Otis
Class: Fighter
Level: 10th
Location: the Smithy, at #7 on the Nulb map
Notes: a useful merchant of masterwork items, and capable fighter. Will leave your party if you return to Nulb from the Temple. Will rejoin again, but will leave permanently the next time.
Name: Serena
Class: Rogue
Level: 3rd
Location: behind Mona in front of the brothel, at #4 on the Nulb map
Notes: you'll first have to buy her freedom from Mona the gypsy. See the Gypsy Road quest for details
The Temple - Dungeon Level 1
Name: Morgan
Class: Fighter
Level: 2nd
Location: a prisoner at #5 on the Dungeon Level 1 map. See #5 for details
Notes: you'll need a "knock" spell to open the door guarding him. Talks like a blimy pirate
Name: Pitak
Class: Fighter
Level: 2nd
Location: a prisoner at #16 on the Dungeon Level 1 map. See #16 for details
Notes: joins with Tuelk next to him as a team. He's an orc
Name: Tuelk
Class: Fighter
Level: 2nd
Location: a prisoner at #16 on the Dungeon Level 1 map. See #16 for details
Notes: joins with Pitak next to him as a tem. He's an orc
Name: Wonnilon
Class: Fighter/Rogue
Level: 6th multiclass
Location: being held prisoner, in the cell at #17 on the Dungeon Level 1 map. See #17 for details
Notes: is related to two mini-quests within the temple
The Temple - Dungeon Level 2
Name: Oohlgrist
Class: Fighter
Level: ??
Location: in the middle of the most southern part at #16 on the Dungeon Level 2 map
Notes: related to both Water Temple and Fire Temple quests. See #10 and #19 for details. You can only Intimidate him into your party. Multiple attempts at Intimidate will result in him taking less loot, down to 1/4th
The Temple - Dungeon Level 3
Name: Prince Thrommel
Class: Fighter
Level: 10th
Location: in a secret room at #32 on the Dungeon Level 3 map
Notes: will join your party while you remain in the temple. When you leave, he leaves, but will offer a reward. See #32 on the Dungeon Level 3 map for details. Holds the most powerful weapon in the game, Fragarach.
Name: Scorpp
Class: Fighter
Level: 7th
Location: at #12 on the Dungeon Level 3 map
Notes: a hill giant. Extremely powerful with 30 Strength. Might take away some challenge from the game. Related to Wonnilon's quest at Dungeon Level 2, #17, and Hedrack's quest at Dungeon Level 4, #14. Must fight him before he joins you
The Temple - Dungeon Level 4
Name: Kella
Class: Druid
Level: ??
Location: at #8 on the Dungeon Level 4 map
Notes: wildshaped into a hill giant, she's a druid looking for another druid or a party of true neutral alignment to join
Name: Paida
Class: Fighter
Level: 1st
Location: at #5 on the Dungeon Level 4 map
Notes: one of Hedrack's concubines. You must use a dispel magic spell on her to release her. She's part of Valden's Rescue Paida quest in Hommlet. See The Rescue of Paida quest for details.
Earth Elemental Node
Name: Jaer
Class: Rogue
Level: 1st
Location: at #7 on the Earth Elemental Node map
Notes: a weaver from Nulb. Throws a special kind of low-level fire splash grenade as his attack. There's a pre-patch crash bug in that if you travel on the world map with Jaer in your party, the game locks up
Name: Sargen
Class: Wizard
Level: 5th
Location: at #9 on the Earth Elemental Node map
Notes: he's crazy. He's got zero spells. Offers gold for his return to civilization. See #9 for details
Air Elemental Node
Name: Ashrem
Class: Cleric
Level: 6th
Location: at #10 on the Air Elemental Node map
Notes: the brother of Alrrem, High Priest of the Fire Temple. Seeks revenge
Name: Taki
Class: Fighter
Level: 7th
Location: at #3 on the Air Elemental Node map
Notes: has merely 44hp. Must be rolling legit ;)
Fire Elemental Node
Name: Darley
Class: Sorceress
Level: 10th
Location: at #9 on the Fire Elemental Node map
Notes: she has a secret, and a lot of hit points for a sorceress. See #9 for details
Random Encounters on the World Map
Name: Zaxis
Class: Bard
Level: 5th
Location: a random encounter on the World Map
Notes: searching for his sister, a half-elven wizard named Ima