Spider

Tiny beast, unaligned

Armor Class: 12
Hit Points: 1 (1d4-1)
Speed: 20 ft., climb 20 ft.

STR: 2 (−4)
DEX: 14 (+2)
CON: 8 (−1)
INT: 1 (−5)
WIS: 10 (+0)
CHA: 2 (−4)

Skills: Stealth +4
Senses: darkvision 30 ft., passive Perception 12
Languages: —
Challenge: 0 (10 XP)
Proficiency Bonus: +2

Spider Climb. The spider can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Web Sense. While in contact with a web, the spider knows the exact location of any other creature in contact with the same web.

Web Walker. The spider ignores movement restrictions caused by webbing.

Actions

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 1 piercing damage, and the target must succeed on a DC 9 Constitution saving throw or take 2 (1d4) poison damage.

How many for your party

Copies of the spider (10 XP each) against a party of four characters of the same level. Build mixed fights in the encounter builder.

Number of Spider for each difficulty, party of four
Party level	Easy	Medium	Hard	Deadly
Level 1	5–7	8–10	11–13	14–20
Level 2	8–13	14	15–19	20
Level 3	11–14	15–20	—	—

In these lists

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Questions

What CR is the Spider?

The Spider is challenge 0, worth 10 XP, with a proficiency bonus of +2.

How many hit points does the Spider have?

1 hit points (1d4-1), with AC 12.

How many should I use against four 1st-level characters?

Against four level 1 characters, 8–10 is medium and 11–13 is hard by the encounter XP budget.