Hey! Since the beta 1.5 update, there are web blocks, and I saw that you had written a shiny/mini-boss spider could drop something like that... and as of now, there are no real ways to get web, so maybe that could be it?
1) Did you take shiny from Pokémon?
2) Why not just have the giant be the zombie mini boss? Its already programed in the game (not fully) and is quite strong.
3) Minecraft needs boss fights and mini bosses.