I squished the Spider
I finally beat Spider 20. Thanks to all of the forum for you help. Special thanks to @kramaswamy.kr for his advice and patience.
It took me 2 months of gearing and adding masteries to the right champs. Finally Duchess, Tyrel, FuShan, Coldheart, Armiger. Now it looks so easy. Anyone who is struggling with the game, dont give up.