How does what work?
Abilities? just take the original creatures abilities and add the class abilities.
CR? adding one level of a PC class to an NPC increases the CR by 1, so I would say the same goes for adding class levels to creatures with racial HD.
they just add up
What Kyras said, you just put class hit die on top of racial hit die.
In the back of the bestiary(and somewhere in the SRD) is a list of creature types and subtypes(for some) that list the hit die type and racial skills, BAB, proficiencies and abilities. The quickest way is just taking average for a die(like 4.5 for d8) and just multiplying by the number of racial hit die.
So for example if you want a hill giant barbarian 5th;
You take the stat block for the hill giant, which has 10 racial HD.
And then you give it all the abilities, hp, BAB, and feats that a 'normal' barbarian would get on top of those.
so its hit points would be: 10d8 + 5d12 + 60(15 "levels" times CON modifier)
and BAB would be: +7 +5 = 12 -> 12/7/2 for three iteratives.
three extra feats and 1 ability score increase.
It's a lot like multiclassing, just taking the racial HD as levels in a class.
So you get feats when racial+class HD is odd, and ability score increase whan racial+class HD is 4,8,12,16 and so on.
If you have a specific creature in mind, we can make a build example from that.
usually it is easier to assume an average roll than to calculate by hand. For example, a creature with 4d8 + 8 hit points will have an average of 26 HP (4.5 * 4 + 8)
never be afraid to ask sorry i did not do a clear write up for you thats my bad and best of luck to you and your game
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If you have a specific creature in mind, we can make a build example from that.
I actually have a few creatures in mind; one is a goblin snake cleric of Rovagug 2 (domains Destruction and War); a gnoll ranger 3 (with humans as his favored enemies and mountain as his favored terrain plus a hyena animal companion); a lizardfolk druid 4 (with a monitor lizard animal companion); and the final boss, a fire giant barbarian 6/fighter 5 (I want to get this NPC's CR to around 17-20; so if this class combination is too high, let me know).
If this is too much, then I'll try to reduce the number of creatures as examples.
If you have a specific creature in mind, we can make a build example from that.I actually have a few creatures in mind; one is a goblin snake cleric of Rovagug 2 (domains Destruction and War); a gnoll ranger 3 (with humans as his favored enemies and mountain as his favored terrain plus a hyena animal companion); a lizardfolk druid 4 (with a monitor lizard animal companion); and the final boss, a fire giant barbarian 6/fighter 5 (I want to get this NPC's CR to around 17-20; so if this class combination is too high, let me know).
If this is too much, then I'll try to reduce the number of creatures as examples.
What level are you playing?
goblin snake cleric of Rovagug 2 (domains Destruction and War)is CR 2
a gnoll ranger 3 (with humans as his favored enemies and mountain as his favored terrain plus a hyena animal companion)is CR 4 But it dose not get an animal companion till 4th level ranger.
a lizardfolk druid 4 (with a monitor lizard animal companion) is CR 4
The final boss, a fire giant barbarian 6/fighter 5 is CR 21
pfft, Average Hp's? MAX them baby!
K-Ray
That's how I DM
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Tom S got you covered on CRs(adding one class level adds one to CR), so I'll make a (slightly more) detailed example of the lizardfolk druid 4th:
Give him some new ability scores from an NPC array or point buy. then modify these by: Str +2, Con +2, Int -2
race bonuses: +5 nat AC, swim 15ft(or climb 15ft).
Level / Hit Dice
1st - 1d8 humanoid(reptilian), feat
2nd - 1d8 humanoid(reptilian)
3rd - 1d8 druid, feat
4th - 1d8 druid, ability score increase
5th - 1d8 druid, feat
6th - 1d8 druid
that's 6 HD: total of 3 feats and 1 ability score increase.
hp: 6d8+6xCON
skill points: 2+2+4+4+4+4+(6xINT) = 20+6xINT
+4 racial bonus to acrobatics
BAB +4
saves(race class)
fort +7(+3 +4)
ref +1(+0 +1)
will +4(+0 +4)
Spells:
2nd - 2+bonus
1st - 3+bonus
orisons - 4 at will
SQ: hold breath, natural bond(monitor lizard companion), nature sense(+2 on know[nature] and survival), orisons, wild empathy, woodland stride, trackless step, resist nature's lure, wild shape(1/day, beast shape I)
This should illustrate the process of adding levels to monsters. The animal companion is the same as for any other level 4th druid. He should have wealth like an 6th level NPC.
I don't know how deep you want this character, but maybe consider skill points in linguistics for common(or as GM you can give it that for free) if he talks to the PCs. And climb and swim speeds give some bonuses to skill checks and others.