My favorite char in NwN is Half-Orc fighter/barbarian [I have no expansions].I started the game with 20str ,12dex[full plate armor has +1dex max ,so 12dex fits nicely] ,14cons ,8wis,10int and 6 cha[no need persuasion much I am chaotic evil

]
I really had fun with this char ,through the game I never had difficulty with any creature ,I just plainly attacked anyone I saw with my greataxe and knockdown the mages, and in the last chapters ,with my 35str [with rage this score is not going further so my rage became half-useless

] I chopped every boss in my path with ease.I also collected 760.000gold
***But now I have a bad problem : In chapter 4 where two dragons attack you; I slayed them ,then I opened the two guardian gates but I CANNOT ENTER THE CAVE ,it seems my half orc is too tall or large to enter the cave

I left click the cave in many positions and I also try right click and try to press use ,but only examine option is available for this entrance.***
Because of this bug I just cannot finish this game, any advice for me maybe?