Claws. Melee Attack Roll: +6, reach 5 ft. Hit: 8 (1d8 + 4) Slashing damage. If the target is a Large or smaller creature and the allosaurus moved 30+ feet straight toward it immediately before the hit, the target has the Prone condition, and the allosaurus can make one Bite attack against it.
The allosaurus isn’t in the 2014 SRD 5.1; this is its stat block from the SRD 5.2.
How many allosauruses for a fight?
An allosaurus is worth 450 XP. Using the 2024 encounter budgets (SRD 5.2), this is how many allosauruses fit each difficulty for a party of four characters of the same level. A dash means even one would be over the budget.
Party level
Low
Moderate
High
2nd
—
1
1
3rd
1
2
3
4th
2
3
4
5th
4
6
9
6th
5
8
12
7th
6
11
12+
8th
8
12+
12+
9th
11
12+
12+
Budgets add up every monster’s XP, so you can swap some for other creatures of the same total. Try other party sizes and mixes in the encounter calculator.
How the allosaurus compares at CR 2
Against the 43 other challenge 2 monsters in the SRD 5.1, the allosaurus has more hit points than 27 of them, which makes it tougher than most at its CR. See every CR 2 monster.