Spelljammer
Cleric
Spell progression chart
Cleric Spell Level
Level 1 2 3 4 5 6* 7**
1 1 - - - - - -
2 2 - - - - - -
3 2 1 - - - - -
4 3 2 - - - - -
5 3 3 1 - - - -
6 3 3 2 - - - -
7 3 3 2 1 - - -
8 3 3 3 2 - - -
9 4 4 3 2 1 - -
10 4 4 3 3 2 - -
11 5 4 4 3 2 1 -
12 6 5 5 3 2 2 -
13 6 6 6 4 2 2 -
14 6 6 6 5 3 2 1
15 6 6 6 6 4 2 1
16 7 7 7 6 4 3 1
17 7 7 7 7 5 3 2
18 8 8 8 8 6 4 2
19 9 9 8 8 6 4 2
20 9 9 9 8 7 5 2

* Usable only by clerics with 22 or greater Willpower.
** Usable only by clerics with 24 or greater Willpower.

BONUS SPELLS
Clerics with a high WP gain bonus spells, as indicated below
WP 18 - 1st level spell
WP 19 - 1st level spell
WP 20 - 2nd level spell
WP 21 - 2nd level spell
WP 23 - 3rd level spell
WP 25 - 4th level spell
WP 26 - 1st level spell and 3rd level spell
WP 27 - 2nd level spell and 4th level spell
WP 28 - 3rd level spell and 5th level spell
WP 29 - 1st level spell, 2nd level spell, 4th level spell
WP 30 - 5th level spell, 6th level spell, 7th level spell

Thus a cleric with a 23 WP gains 2 additional 1st level spells, 2 additional 2nd level spells and 1 additional 3rd level spell (in addition to those spells that he is entitled to due to his level).