first there is a way to revive aeries but only on the jap version. if you got that go to near where aeries lives and talk to the "ill" guy in the pipe (hes apparantly one of the ancients) and hell die in order to revive aeries. voila

the tissues do absolutely f-all they jus piss you off (or hu knows if ur crap in the arena, really crap, then maybe you could get enough together to sell for a small bundle)

and the sector seven key IS in bone villiage, go to the second floor, dont order any searches, go to where the smoke form the house/hut meets the ground and dig right there. (and do that on a search for good treasure)


to beet sephiroth.
--the best way (that ive found) is to have a healer on the back row with cure barrier reflect and so on.
--a mage on the front row with powerful magic like KOTR ultima flare, Maybe an "aga" class magic or two and as many mp pluses as possible, oh and lots of hp pluses because magic/summon materia takes max hp down.
--finally a fighter type person (i suggest cloud) give them no magic or summon materia, but give them things like 4*cut or something to that effect.
--what to do from there id have fought is pretty straight forward give him a good kickin with whatever you like.