Here is my (hasitly prepared) comparison of a straight Sorcerer/DD compared to a single classed Half Dragon Sorcerer.
Thinking out loud here...
A Sor 6/DD10 Vs. Sor 13 with the Half-Dragon Template
I chose this combo because it is just about the earliest a sorcerer could take DD.
Both Get:
Natural Armor +4
Breath Weapon
Claw and Bite attacks
Both have the ability to use spell completion items, i.e. scrolls, wands, staves, etc.
Assume human:
Start with the following Ability Scores: 16, 15, 14, 13, 12, 11
===
The Half-Dragon has the following ability scores:
S : 11 --> 19
D : 14
C : 15 --> 17
I : 13 --> 15
W : 12
Ch : 16 -> 18 --> 21 From adding 1 at levels 4, 8, and 12
The Half Dragon has 13 levels of d6 HD.
6 (for first level)
+ 3.5 * 12 = 42
+ 3 (from con) * 12 = 36
for average HP of 84
Has a BAB of +6/+1
Modified to: +10/+6 (for STR)
Spells Known: 9/5/5/4/4/3/2
Spells Per Day: 6/8/7/7/7/7/4
Save as: +7/+6/+9
Skill points: 20 (1st lev) + 5 * 12 levels = 80
===
The DD has the following:
S : 16 --> 24 --> 26 from adding 1 at level 12 and 16
D : 14
C : 15 -- > 17 -> 18 from adding 1 at level 8
I : 12 --> 14
W : 11
Ch : 13 -->15 --> 16 from adding 1 at level 4
The DD has the following HP:
4 (for first level)
+ 2.5 * 5 = 12.5
+6.5 * 10 = 65
+4 (for con) * 16 = 64
For an average of: 145.5
Has a BAB of +10/+5
Modified to +17/+12
Spells Known: 7/4/2/1
Spells Per Day: 6/7/6/10
Save as: +13/+7/+12
Also, the DD gests blind sense and wings.
Skill points: 16 (first lev) + 4 * 12 levels + 5 * 3 levels = 79 (8 must go to Knowledge Arcana)
So far the differentce boils down to :
60 more HP for the DD
Blindsense 60' for the DD
Wings speed 30' for the DD
Better saves for the DD (by +6/+1/+3)
More spells Known for the Half Dragon
More Spells per day for the Half Dragon
One would assume that the Half dragon would focus on Sorcerer like feats (metamagic, etc.) but the DD could focus on other feats, like Multi-attack, Improved Natual Attack (moving his claw attacks to 1d8), and Fly-by attack.
Also, the spell selection would be entirely different. The DD would probably want enlarge person (esp. w/ImpNatAttack) making his claw and bite attack become 2d6 from his size increase.
For reference with Imp Nat Attack the DD would attack at (I believe):
+17 Bite +15 claw + 15 Claw/+12 Bite +10 Claw +10 claw
A FTR 16 w/24 STR would be:
+23/+18/+13/+8
Personally, I think the DD character very usable character as described here easily wading into melee. The problem is getting to that level. Really, a Sor 6/DD 4 is pretty weak imho.
g!
Thinking out loud here...
A Sor 6/DD10 Vs. Sor 13 with the Half-Dragon Template
I chose this combo because it is just about the earliest a sorcerer could take DD.
Both Get:
Natural Armor +4
Breath Weapon
Claw and Bite attacks
Both have the ability to use spell completion items, i.e. scrolls, wands, staves, etc.
Assume human:
Start with the following Ability Scores: 16, 15, 14, 13, 12, 11
===
The Half-Dragon has the following ability scores:
S : 11 --> 19
D : 14
C : 15 --> 17
I : 13 --> 15
W : 12
Ch : 16 -> 18 --> 21 From adding 1 at levels 4, 8, and 12
The Half Dragon has 13 levels of d6 HD.
6 (for first level)
+ 3.5 * 12 = 42
+ 3 (from con) * 12 = 36
for average HP of 84
Has a BAB of +6/+1
Modified to: +10/+6 (for STR)
Spells Known: 9/5/5/4/4/3/2
Spells Per Day: 6/8/7/7/7/7/4
Save as: +7/+6/+9
Skill points: 20 (1st lev) + 5 * 12 levels = 80
===
The DD has the following:
S : 16 --> 24 --> 26 from adding 1 at level 12 and 16
D : 14
C : 15 -- > 17 -> 18 from adding 1 at level 8
I : 12 --> 14
W : 11
Ch : 13 -->15 --> 16 from adding 1 at level 4
The DD has the following HP:
4 (for first level)
+ 2.5 * 5 = 12.5
+6.5 * 10 = 65
+4 (for con) * 16 = 64
For an average of: 145.5
Has a BAB of +10/+5
Modified to +17/+12
Spells Known: 7/4/2/1
Spells Per Day: 6/7/6/10
Save as: +13/+7/+12
Also, the DD gests blind sense and wings.
Skill points: 16 (first lev) + 4 * 12 levels + 5 * 3 levels = 79 (8 must go to Knowledge Arcana)
So far the differentce boils down to :
60 more HP for the DD
Blindsense 60' for the DD
Wings speed 30' for the DD
Better saves for the DD (by +6/+1/+3)
More spells Known for the Half Dragon
More Spells per day for the Half Dragon
One would assume that the Half dragon would focus on Sorcerer like feats (metamagic, etc.) but the DD could focus on other feats, like Multi-attack, Improved Natual Attack (moving his claw attacks to 1d8), and Fly-by attack.
Also, the spell selection would be entirely different. The DD would probably want enlarge person (esp. w/ImpNatAttack) making his claw and bite attack become 2d6 from his size increase.
For reference with Imp Nat Attack the DD would attack at (I believe):
+17 Bite +15 claw + 15 Claw/+12 Bite +10 Claw +10 claw
A FTR 16 w/24 STR would be:
+23/+18/+13/+8
Personally, I think the DD character very usable character as described here easily wading into melee. The problem is getting to that level. Really, a Sor 6/DD 4 is pretty weak imho.
g!