View source for THAC0 Tables

Different types of character and creature have different THAC0 they may consult.

==Which Table To Use?==
A character uses the best THAC0 table they qualify for by their Level or HD. For example, a Level 9/11 Fighter/Thief would gain a THAC0 of 12 from Fighter and only 15 from Thief. As such, they use 12 for their THAC0.

Classless Characters (and Pseudo-Class Characters) use the Creature THAC0 table with either their Hit-Dice or Level. 

If they later take a Class, they use either their THAC0 from HD on the Creature table or what they gain from Class levels, whichever is higher. For instance, a 12-1 HD Hill Giant gains 9 THAC0 by default. If the character took the Fighter Class and gained 5 levels, this would not increase their effective HD by 5 on the Creature Table, granting them an effective HD of 17 and a THAC0 of 3. Instead, it would allow them to choose between THAC0 16 (Level 5 Fighter) or THAC0 9 (12-1 HD Hill Giant).

==THAC0 Tables==
THAC0 Tables are divided between the Class Groups - Priest, Rogue, Warrior and Wizard. Furthermore, a Creature table grants a base THAC0 to creatures based on their HD, reflecting the power of stronger creatures.

{| class="wikitable"
!colspan="11"|THAC0 Tables
|-
|'''Level/HD'''
|'''Priest'''
|'''Rogue'''
|'''Warrior'''
|'''Wizard'''
|'''Creature'''
|-
|0
|20
|20
|20
|20
|20
|-
|1
|20
|20
|20
|20
|19
|-
|2
|20
|20
|19
|20
|19
|-
|3
|20
|19
|18
|20
|17
|-
|4
|18
|19
|17
|19
|17
|-
|5
|18
|18
|16
|19
|15
|-
|6
|18
|18
|15
|19
|15
|-
|7
|16
|17
|14
|18
|13
|-
|8
|16
|17
|13
|18
|13
|-
|9
|16
|16
|12
|18
|11
|-
|10
|14
|16
|11
|17
|11
|-
|11
|14
|15
|10
|17
|9
|-
|12
|14
|15
|9
|17
|9
|-
|13
|12
|14
|8
|16
|7
|-
|14
|12
|14
|7
|16
|7
|-
|15
|12
|13
|6
|16
|5
|-
|16
|10
|13
|5
|15
|5
|-
|17
|10
|12
|4
|15
|3
|-
|18
|10
|12
|3
|15
|3
|-
|19
|8
|11
|2
|14
|1
|-
|20+
|8
|11
|1
|14
|1
|-
|}