MiniCompounder

Level KXP Spells
 TH
11 * original(none)As original *2
21.5 * original(none)As original *2
32 * original(none)As original *2
42.5 * original(none)As original *2
53 * original(none)As original *2
63.5 * original(none)As original *2
74 * original(none)As original *2
84.5 * original(none)As original *2
95 * original(none)As original *2
105.5 * original(none)As original *2
116 * original(none)As original *2
126.5 * original(none)As original *2
137 * original(none)As original *2
147.5 * original(none)As original *2
158 * original(none)As original *2
168.5 * original(none)As original *2
179 * original(none)As original *2
189.5 * original(none)As original *2
1910 * original(none)As original *2
2010.5 * original(none)As original *2
2111 * original(none)As original *2
2211.5 * original(none)As original *2
2312 * original(none)As original *2
2412.5 * original(none)As original *2
2513 * original(none)As original *2
2613.5 * original(none)As original *2
2714 * original(none)As original *2
2814.5 * original(none)As original *2
2915 * original(none)As original *2
3015.5 * original(none)As original *2
3116 * original(none)As original *2
3216.5 * original(none)As original *2
3317 * original(none)As original *2
3417.5 * original(none)As original *2
3518 * original(none)As original *2
3618.5 * original(none)As original *2
Requisites:Original +18 each; 3 class slots
Alignment:As original
HD/level:(*1)d(*2) original (no &'s)
Weapon Prof.:As original +1 base, -1 rate
To Hit Table:As original *2
Save Table:As original *2
Reference:RDM {Reduced Compounder}
Groups:Custom, Alternate
Complexity:CF=4
Pick another class you know. The class chosen cannot be Custom, Concordant, or Demigod group, or itself have subclasses (e.g. Master Thief). You get 1 instance of that class per even level of MiniCompounder class (where its level is your LVL/2).
DM Note: For abilities that refer to “Normal” Concepts (ToHit, Dmg, AC, Saves, hps, Number of attacks, Str, Dex, Con, Int, Wis, Chr, Rogue Points, PSPs, SLs, Proficiencies, Skills, Kits, Feats, Resistances, Level Picks, Status effects, Backstab, Limited ML), they fully stack. For abilities that refer to “Exotic” Concepts (++’s, Animal Companions, CL, Cml, Familiars, GGL, HD, HNCL, Levels of Exceptional Stat, Luck, Mounts, Movement Rate, Personality, Research Points, Summons, Wear Locations), the LVL formula reduces a step. For abilities that refer to “Very Exotic” Concepts (Actions, CCL, Character Slots, Class Slots, HCL, LVL, ML, Multiplier, Number of Segments, Player Picks, Power Factors, Psi Frequencies, Race Slots), the LVL formula reduces two steps (LVL^^N->LVL^N->LVL*N->LVL).
Things that normally would not stack do stack with MiniCompounder. Some examples:
You get one instance of stat bonus for your spell progression per even level (e.g. if you pick "Cleric2", when you're level 4, you'll have 2 Cleric2 Level 2 spell progressions, each with a Wis bonus).
For Rogue abilities, you get the Rogue points per class (as expected), but multiple instances of the same rogue ability stack. This includes base and stat bonus. For example, if you have 150% Pick Pockets in each of your 10 Thief1 classes (from being a level 20 MiniCompounder), your Pick Pockets is 1500%.
You get a full psionic pool per class, and you may transfer points between pools freely.
For XP, this class costs the indicated amount times your base class. This does require you to write down your own little XP table.
The Hit Dice is double the die size (e.g. 2d3 would become 2d6).
The Weapon Proficiencies has +1 to the base, and -1 to the divisor for the divisor rate. If the rate is multiplicative instead, add 1. (e.g. 1+level/4 becomes 2+level/3; 3+level becomes 4+level*2; 0+level*2 becomes 1+level*3.)