Man, I wish I had known about this when I ran my 4E Dragonlance Age of Mortals game in the Temple of Hurim!
Glad you like them- but here's the updated to MM3 standards version.

There are also a couple more variants for you.
If you're looking for monster conversions, see the link to the main thread of the Monster Project in my sig.
ARANEA
Source: 3e Monster Manual.
An aranea is a medium-sized spider with a pair of small humanoid arms that is able to change its shape into that of a female humanoid, usually a human or elf. Though they are rare, aranea have a distinct culture. They tend to dwell either in remote areas underground or in the forest, or secretly, hiding amongst their humanoid prey while disguised as one of them.
Creepy Reproduction: All aranea are female. To reproduce, an aranea must assume humanoid form and trick a male humanoid to mate with it. Later, it lays a clutch of already-fertilized eggs. When the eggs hatch, the aranea young devour each other until only a handful survive, growing more intelligent with each sister that they devour.
Spidery Viewpoint: An aranea's perspective is far more spider-like than humanoid in nature. They view humanoids primarily as prey and eat their mates. An aranea enjoys capturing a victim and storing it for later, so sometimes an aranea lair will have still-living creatures within it. An aranea has no problem staying hidden and still for hours while waiting for an opportunity to spring. Nonetheless, other creatures can sometimes strike temporary bargains with aranea with promises of live food or treasure.
Loose Alliances: Aranea do not prey on each other; instead, they coexist peacefully and sometimes even form loose alliances, but are not too prone to close association. However, an aranea does not form bonds of affection, nor does it feel any sense of love for its offspring. Instead, cold arachnid logic informs the relationships that an aranea forms. It is as likely to work with an evil human that promises it frequent live villagers to eat as it is another aranea.
Aranea Spy --- Level 7 Lurker
Medium fey magical beast (spider) --- XP 300
HP 64; Bloodied 32 Initiative +12
AC 20; Fortitude 18; Reflex 20; Will 19 Perception +9
Speed 6, climb 5 (spider climb) Low-light vision
STANDARD ACTIONS
(mbasic or rbasic) Dagger (poison, weapon) * At Will
Attack: Melee 1 or ranged 5/10 (one creature); +12 vs. AC.
Hit: 2d4+5 damage, plus ongoing 5 poison damage (save ends).
(mbasic) Bite (poison) * At Will
Requirement: The aranea must be in its spiderlike form.
Attack: Melee 1 (one creature); +12 vs. AC.
Hit: 1d6+7 damage, plus ongoing 5 poison damage (save ends).
(melee) Blinding Strike (weapon) * At Will
Attack: Melee 1 (one creature that is bloodied or taking ongoing poison damage); +12 vs. AC.
Hit: 3d4+12 damage, and the target is blinded (save ends).
Aftereffect: Until the end of the encounter, the target takes a -2 penalty to saving throws against poison effects.
MOVE ACTIONS
Shift into Shadow * At Will
Effect: The aranea spy shifts up to 3 squares and gains concealment until the end of its next turn.
MINOR ACTIONS
Change Shape (polymorph) * At Will
Effect: The aranea changes shape to become either a humanoid female of the aranea's choice or a spiderlike creature with a pair of small humanoid arms below its mandibles. This change lasts until the aranea uses this ability again (or until another power or effect changes its shape). The aranea's humanoid forms all share the same basic face, and the aranea cannot impersonate specific individuals. While in humanoid form, the aranea loses the magical beast type and gains the humanoid type.
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Skills Bluff +11, Insight +9, Stealth +13
Str 11 Dex 20 Wis 12
Con 16 Int 15 Cha 16
Alignment chaotic evil Languages Aranea, Common, Elven
Equipment leather armor, 2 daggers
Aranea Webspinner --- Level 7 Controller
Medium fey magical beast (spider) --- XP 300
HP 77; Bloodied 38 Initiative +6
AC 21; Fortitude 17; Reflex 19; Will 21 Perception +5
Speed 6, climb 5 (spider climb) Low-light vision
STANDARD ACTIONS
(mbasic or rbasic) Dagger (weapon) * At Will
Attack: Melee 1 or ranged 5/10 (one creature); +12 vs. AC.
Hit: 1d4+5 damage.
(area) Web * Recharge 4 5 6
Attack: Area burst 1 within 10 squares (each creature in burst); +10 vs. Reflex.
Hit: The target is restrained (escape DC 16).
Effect: The area of the burst becomes a zone of sticky webbing that persists for 1 hour. 10 points of fire damage to any creature or object in a square of the zone removes that square of the zone. The zone counts as difficult terrain, and any creature that ends its turn in the zone is immobilized (escape DC 11). Spiders are immune to the effects of the zone.
MINOR ACTIONS
(ranged) Spit Poison (poison) * At Will 1/round
Attack: Ranged 10 (one creature); +10 vs. Reflex.
Hit: 1d6+5 poison damage, plus ongoing 5 poison damage (save ends).
Change Shape (polymorph) * At Will
Effect: The aranea changes shape to become either a humanoid female of the aranea's choice or a spiderlike creature with a pair of small humanoid arms below its mandibles. This change lasts until the aranea uses this ability again (or until another power or effect changes its shape). The aranea's humanoid forms all share the same basic face, and the aranea cannot impersonate specific individuals. While in humanoid form, the aranea loses the magical beast type and gains the humanoid type.
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Skills Arcana +10, Bluff +13
Str 11 Dex 17 Wis 14
Con 13 Int 15 Cha 20
Alignment chaotic evil Languages Aranea, Common, Elven
Equipment 2 daggers, totem
Aranea Youth --- Level 9 Minion Skirmisher
Medium fey magical beast (spider) --- XP 100
HP 1; a missed attack never damages a minion Initiative +10
AC 23; Fortitude 19; Reflex 23; Will 21 Perception +4
Speed 6, climb 5 (spider climb) Low-light vision
STANDARD ACTIONS
(mbasic or rbasic) Dagger (weapon) * At Will
Attack: Melee 1 or ranged 5/10 (one creature); +14 vs. AC.
Hit: 8 damage.
(melee) Bite (poison) * At Will
Requirement: The aranea must be in its spiderlike form.
Attack: Melee 1; +12 vs. Fortitude.
Hit: 5 damage, plus ongoing 5 poison damage (save ends). If the target is already taking ongoing poison damage, that poison damage increases by 2 instead.
MOVE ACTIONS
Scuttle * At Will
Effect: The aranea shifts up to 2 squares.
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Str 11 Dex 18 Wis 10
Con 13 Int 15 Cha 15
Alignment chaotic evil Languages Aranea, Common, Elven
Equipment leather armor, 2 daggers
Aranea Witch --- Level 10 Elite Controller
Medium fey magical beast (spider) --- XP 1,000
HP 50; Bloodied 101 Initiative +7
AC 24; Fortitude 20; Reflex 21; Will 25 Perception +7
Speed 6, climb 5 (spider climb) Low-light vision
Saving Throws +2; Action Points 1
STANDARD ACTIONS
(mbasic or rbasic) Dagger (poison, weapon) * At Will
Attack: Melee 1 or ranged 5 (one creature); +15 vs. AC.
Hit: 2d4+3 damage, plus ongoing 10 poison damage (save ends).
(close) Witchy Words (charm, psychic) * At Will
Attack: Close burst 10 (one creature in burst); +13 vs. Will. Deafened creatures are immune to this attack.
Hit: 3d6+8 psychic damage.
Effect: The aranea witch slides the target up to 3 squares, and the target makes a basic attack as a free action at a target of the aranea's choice.
(close) Frightening Cackle (fear, psychic) * Encounter
Attack: Close burst 3 (each enemy in the burst); +12 vs. Will.
Hit: 4d10+5 psychic damage, and the aranea pushes the target up to 4 squares and the target suffers a -2 penalty to saving throws (save ends).
MINOR ACTIONS
Change Shape (polymorph) * At Will
Effect: The aranea changes shape to become either a humanoid female of the aranea's choice or a spiderlike creature with a pair of small humanoid arms below its mandibles. This change lasts until the aranea uses this ability again (or until another power or effect changes its shape). The aranea's humanoid forms all share the same basic face, and the aranea cannot impersonate specific individuals. While in humanoid form, the aranea loses the magical beast type and gains the humanoid type.
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Skills Arcana +13, Bluff +15
Str 11 Dex 15 Wis 14
Con 13 Int 17 Cha 21
Alignment chaotic evil Languages Aranea, Common, Elven
Equipment 2 daggers, totem