What level are you playing on? And do you have access to scrolls?
If you can find some way to cast Shapechange, there are many, many ways to make an invulnerable character.
Oldie with a new twist: Extraordinary Spell Aim + Antimagic Field, Shapechange into a twelve-headed Pyrohydra (good luck getting cold damage without magic). Have someone cut off your heads, slowly, until you have 24. Cast a UMD'd Divine Power on youself to top it off, and add a Monk's Belt for the unarmed strike and wis-to-ac. Instant close-combat monster. Enemy fighters will be running away like little girls.
If you can find some way to cast Shapechange, there are many, many ways to make an invulnerable character.
Oldie with a new twist: Extraordinary Spell Aim + Antimagic Field, Shapechange into a twelve-headed Pyrohydra (good luck getting cold damage without magic). Have someone cut off your heads, slowly, until you have 24. Cast a UMD'd Divine Power on youself to top it off, and add a Monk's Belt for the unarmed strike and wis-to-ac. Instant close-combat monster. Enemy fighters will be running away like little girls.