Shadowdweller said:
+6 via racial hit dice however, a centaur just isn't worth it IMO.
Ha.
I'm assuming that you are talking about lower levels. A centaur fighter (barbarian, ranger, paladin) rocks.
The +4 to Con eventually outshines two levels worth of hps; the +4 base attack bonus, +4 str mod, -1 size is more than a human fighter gets to hit at level 6; and the natural armor now stacks.
They get spot and listen as class skills. They get good ref and will saves, and +4 to Dex and +2 Wis (which helps offset the fighter level crappy saves.) They use bigger weapons. Their land speed is 50 (which is important because it's so hard to constantly fly now). They get a +4 to grapple checks.
Come on, not worth it? Bah.
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On a different note, trolls using weapons are silly.
The best part about natural weapons is that they don't get the iterative attack penalty. Trolls should be milking their two claw attacks + rend + grappling spellcasters.
A troll with a greatsword should be shot.
And seriously, fire and acid are nothing when you have a pocket cleric buddy with protection from energy.
The "I can't walk into town" thing is also overhyped. At high-levels, it just isn't a problem. Any party worth their salt can see the effectiveness of a troll as a tank and should sell their left wingnut to get the chance to buy the troll their magic items. (Especially a Ring of Sustenence and/or a Helm of Opposite Alignment.)
And if a DM is leading the party by the nose, forcing them into city adventures, well, luckily, that's not
my DM.