Phase Spiders altered by the Drow to utilize the Shadowfell rather than the Ethereal Plane, a shadow spider chills the air near it, as though the lightless depths follow it even here.
Shadow Spider
Monstrosity
Attributes
Unorganized
Size
Huge
Type
Monstrosity
AC
14
HP
65
Speed
30ft, Climb 30ft
CR
5
Ability Scores
STR
15
DEX
18
CON
12
INT
9
WIS
10
CHA
8
Traits
Shadow Jaunt
As a bonus action, the spider can magically shift from the Material Plane to the Shadowfell, or vice versa.
Spider Climb
The spider can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.
Web Walker
The spider ignores movement restrictions caused by webbing.
Actions
Bite
Melee Weapon Attack: +6 to hit, reach 5 ft., one creature. Hit: 15 (2d10 + 4) necrotic damage, and the target’s Strength score is reduced by 1d4. The target dies if this reduces its Strength to 0. Otherwise, the reduction lasts until the target finishes a short or long rest. If a non-evil humanoid dies from this attack, a new shadow rises from the corpse 1d4 hours later.