To defeat the thunder demon,you will be outside the museum.It will be attacking you with thunder bolts.To avoid getting hurt,go under the trees.If it follows you keep going around the tree.To attack it ,while its charging for the sky bolt attk, take a rock and throw it at the demon(thats what i did). It will be stunned for a few seconds.During that time attack it with everything you have got .Repeat the process till it is over.
Defeat The water demon
To get to the water demon , you have to go to Valmonts warehouse after you get the pufferfish for Uncle.there the cutscene starts and then the warehouse will be with water.the demon will cum & attack if u r in the water.go up the staircase and stay a bit far from the railing to dodge its attks.If u want to attk it , there will be ice cubes.throw 1 and it will freeze kick it 2 or 3 times. Repeat the process till Uncle comes.
Talismen powers
When your talismen powers start to fad away, look in jars to replenish them.