As soon as you step on Sentinel Island all this quests are lost. You had an option to open a traveling shrine in the temple and finish all quests in the valley, but now it full of poisonous fog and lvl 27 dragons.
I'm a little confused, therefor this question:
I'm now IN Maxos Temple, but I past the waypointscrine now and I'm not sure if I can back again to that scrine at the end of Maxos Temple savety, without poisonous gaz??
I'm a little "stuck" somewhere in Maxos Temple

... I'm on: 4 rooms I can go round and round, but search for a sollution how to open a door ... but every time I step in one of the rooms again, those fou enemies will kill me, but my health-potions are almost used up!!
I think I must go for my other save game ... what the hell is going on in this Temple???
By now, thanks a lot!