It will be a near gray spell on wheel. Mana webs, with bloom on you'll notice your spider webs glowing vibrantly! If it's too bright, you can turn it down in the graphics menu, turn down your bloom threshold.
Book menu to change the power of the webs! Hf!

Updated to U11, fixed menu, planning to rework the entire mod soon (again)

Updated to U11

You can now spin webs, attempt to tether terrain to terrain and you will see a web appear. Enemies will not walk into it, but will pathfind around it. Added elasticity to the webs, which is an editable option. Go into the options & fiddle with it. Enjoy!