you hardly killed Andariel but want to go to Tran Athula ?

)))
get better gear before even thinking about Destruction Tran unless you enjoy getting 1-shot . it's doable with a "hit and run" strategy : cast few Phakanx and run away to avoid getting hit , cast more Phalanx , run -> pick up loot -> advance-> Phalanx -> Run ->Phalanx .
if you stand and fight with the gear you got you stand no chance , so keep moving
get some minion resistances if you still use fire elementals , the cap is at 75% (mo the rings and amulet with 20% each) so that they survive a few more spells . In tran they will die very fast without minion boosting gear because the amazons deal heavy physical damage so i don't think they will be of much use there .
good luck !
have you finished the black road challenge ?