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Reef Shark

Medium beast, unaligned

Armor Class: 12 (natural armor)
Hit Points: 22 (4d8+1)
Speed: swim 40 ft.

STR: 14 (+2)
DEX: 13 (+1)
CON: 13 (+1)
INT: 1 (−5)
WIS: 10 (+0)
CHA: 4 (−3)

Skills: Perception +2
Senses: blindsight 30 ft., passive Perception 12
Languages: —
Challenge: 1/2 (100 XP)
Proficiency Bonus: +2

Pack Tactics. The shark has advantage on an attack roll against a creature if at least one of the shark's allies is within 5 ft. of the creature and the ally isn't incapacitated.

Water Breathing. The shark can breathe only underwater.

Actions

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 6 (1d8 + 2) piercing damage.

About the reef shark

Smaller than giant sharks and hunter sharks, reef sharks inhabit shallow waters and coral reefs, gathering in small packs to hunt. A full-grown specimen measures 6 to 10 feet long.

How many for your party

Copies of the reef shark (100 XP each) against a party of four characters of the same level. Build mixed fights in the encounter builder.

Number of Reef Shark for each difficulty, party of four
Party level	Easy	Medium	Hard	Deadly
Level 1	1	—	2	3–20
Level 2	2	—	3	4–20
Level 3	2	3–4	5–6	7–20
Level 4	3–4	5–6	7	8–20
Level 5	5–7	8–10	11–14	15–20
Level 6	6–9	10–11	12–14	15–20

In these lists

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Questions

What CR is the Reef Shark?

The Reef Shark is challenge 1/2, worth 100 XP, with a proficiency bonus of +2.

How many hit points does the Reef Shark have?

22 hit points (4d8+1), with AC 12 from natural armor.

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

Against four level 1 characters, 2 is hard by the encounter XP budget.