Every number on this page is arithmetic you can check: Torchline budgets 2,500 XP per character at level 14 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
4,125
5,500
6,875
8,250
Standard — a real fight, rarely lethal
7,500
10,000
12,500
15,000
Hard — someone will probably go down
12,000
16,000
20,000
24,000
Brutal — a character can die here
18,000
24,000
30,000
36,000
These are effective-XP budgets: a group of monsters is multiplied up before it is compared against them, so a budget of 10,000 does not mean 10,000 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 5,500
A lone threat — about 5,500 XP each (×1 crowd multiplier)
Creature
Type
Size
CR
AC
HP
XP
Aboleth
Aberration
Large
10
17
135
5,900
Deva
Celestial
Medium
10
17
136
5,900
Guardian Naga
Monstrosity
Large
10
18
127
5,900
Stone Golem
Construct
Large
10
17
178
5,900
Young Gold Dragon
Dragon
Large
10
18
178
5,900
A pair — about 1,833 XP each (×1.5 crowd multiplier)
Creature
Type
Size
CR
AC
HP
XP
Air Elemental
Elemental
Large
5
15
90
1,800
Barbed Devil
Fiend
Medium
5
15
110
1,800
Bulette
Monstrosity
Large
5
17
94
1,800
Earth Elemental
Elemental
Large
5
17
126
1,800
Fire Elemental
Elemental
Large
5
13
102
1,800
A group of four — about 688 XP each (×2 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 swarm of eight — about 275 XP each (×2.5 crowd multiplier)