Traits

Ethereal Jaunt: Like a bonus action, the spider can able to be shift magically from the material plane to the Ethereal Plane, or maybe vice versa.

Spider Climb: The spider could also climb some difficult surfaces, which includes upside down on ceilings and even without needing for making an ability check.

Web Walker: Basically, the spider can ignore the movement restrictions which are caused by the webbing.

Actions

Bite: Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 7 (1d10 + 2) piercing damage, and also the target must make the DC 11 Constitution saving throw and also taking 18 (4d8) poison damage on the failed to save, or else half as much damage on the successful one. Whenever if the poison damage would reduce the target to the 0 hit points and even the target is almost stable but it has been poisoned for 1 hour, even after regaining Hit Points, and it is Paralyzed while Poisoned in this way.

Attributes Of Phase Spider

AC	13 (Natural Armor)
Alignment	Unaligned
CHA	6
CON	12
Challenge Rating	3
DEX	5
HP	32 (5d10+5)
INT	6
Passive Perception	10
roll 0	1d20 + 4 1d10+2
Roll 1	Poison 1d20 + 0 4d8
STR	15
Senses	Darkvision 60 Ft.
Size	Large
Skills	Stealth +6
Speed	30 ft., climb 30 ft
Type	monstrosity
WIS	10