asy ▁fiction . ▁World building , ▁plot , ▁and ▁character ization ▁have ▁many ▁common ▁convent ions . ▁Liter ary ▁fant asy ▁works ▁operate ▁using ▁these ▁trop es , ▁while ▁others ▁use ▁them ▁in ▁a ▁revision ist ▁manner , ▁making ▁the ▁trop es ▁over ▁for ▁various ▁reasons ▁such ▁as ▁for ▁com ic ▁effect , ▁and ▁to ▁create ▁something ▁fresh ▁( a ▁method ▁that ▁often ▁generates ▁new ▁cl ich és ). ▁ ▁Good ▁vs . ▁evil ▁The ▁conflict ▁of ▁good ▁against ▁evil ▁is ▁a ▁theme ▁in ▁the ▁many ▁popular ▁forms ▁of ▁fant asy ; ▁normally , ▁evil ▁characters ▁in va de ▁and ▁dis rupt ▁the ▁good ▁characters ' ▁lands . ▁J . ▁R . ▁R . ▁Tol k ien ▁del ved ▁into ▁the ▁nature ▁of ▁good ▁and ▁evil ▁in ▁The ▁Lord ▁of ▁the ▁R ings , ▁but ▁many ▁of ▁those ▁who ▁followed ▁him ▁use ▁the ▁conflict ▁as ▁a ▁plot ▁device , ▁and ▁often ▁do ▁not ▁distinguish ▁the ▁sides ▁by ▁their ▁behavior . ▁In ▁some ▁works , ▁most ▁not ably ▁in ▁sword ▁and ▁sor c ery , ▁evil ▁is ▁not ▁opposed ▁by ▁the ▁un ambigu ously ▁good ▁but ▁by ▁the ▁mor ally ▁un re li able . ▁ ▁Hero ▁ ▁Hero ic ▁characters ▁are ▁a ▁main st ay ▁of ▁fant asy , ▁particularly ▁high ▁fant asy ▁and ▁sword ▁and ▁sor c ery . ▁Such ▁characters ▁are ▁capable ▁of ▁more ▁than ▁ordinary ▁behavior , ▁phys ically , ▁mor ally , ▁or ▁both . ▁Sometimes ▁they ▁might ▁have ▁to ▁grow ▁into ▁the ▁role ▁ord ained ▁for ▁them .