A character who has reached level 21 is considered an epic character.
While all tables shown in these rules stop at level 20, there is no
actual level limit. All patterns shown scale, as follows:
earned by CR and XP required for each level: Each level is double the
value two levels prior (i.e. level 21 is double level 19).
by Level: Each level is X*1000 gp more than the last, where X is the
new level (i.e. level 21 is 21,000 gp more than level 20).
BAB, Saves and Prowess: The patterns present in the tables scale using
the shown patterns.
Features: Generally, any class feature that uses class level as part of
a mathematical formula continues to increase using the character’s
class level in the formula.
Spells: For spellcasters, caster
level continues to increase after 20th level. However, spells per day
don’t increase after 20th level.
All characters who are at least 21th level is ageless (i.e. they no