Every number on this page is arithmetic you can check: Torchline budgets 1,200 XP per character at level 10 for a standard fight, scales it by party size, then by the difficulty band. Below each table are the SRD 5.1 creatures that actually land in that budget.
Budgets by party size and difficulty
Difficulty
Party of 3
Party of 4
Party of 5
Party of 6
Skirmish — resources barely dented
1,980
2,640
3,300
3,960
Standard — a real fight, rarely lethal
3,600
4,800
6,000
7,200
Hard — someone will probably go down
5,760
7,680
9,600
11,520
Brutal — a character can die here
8,640
11,520
14,400
17,280
These are effective-XP budgets: a group of monsters is multiplied up before it is compared against them, so a budget of 4,800 does not mean 4,800 XP of monsters.
What actually fits, for a party of four
The crowd multiplier is the part that catches people out. Two creatures count for 1.5× their XP, three to six count double, seven to ten count 2.5×, eleven or more count triple. So the XP you can spend per creature falls fast as the group grows.
Skirmish — budget 2,640
A lone threat — about 2,640 XP each (×1 crowd multiplier)
Creature
Type
Size
CR
AC
HP
XP
Giant Ape
Beast
Huge
7
12
157
2,900
Oni
Giant
Large
7
16
110
2,900
Shield Guardian
Construct
Large
7
17
142
2,900
Stone Giant
Giant
Huge
7
17
126
2,900
Young Black Dragon
Dragon
Large
7
18
127
2,900
A pair — about 880 XP each (×1.5 crowd multiplier)
Creature
Type
Size
CR
AC
HP
XP
Basilisk
Monstrosity
Medium
3
12
52
700
Bearded Devil
Fiend
Medium
3
13
52
700
Blue Dragon Wyrmling
Dragon
Medium
3
17
52
700
Doppelganger
Monstrosity
Medium
3
14
52
700
Giant Scorpion
Beast
Large
3
15
52
700
A group of four — about 330 XP each (×2 crowd multiplier)
Creature
Type
Size
CR
AC
HP
XP
Ankheg
Monstrosity
Large
2
14
39
450
Awakened Tree
Plant
Huge
2
13
59
450
Azer
Elemental
Medium
2
17
39
450
Bandit Captain
Humanoid
Medium
2
15
65
450
Berserker
Humanoid
Medium
2
13
67
450
A swarm of eight — about 132 XP each (×2.5 crowd multiplier)