Slowing traps upgrades are additive or multiplicative?
I've been using viscous tar in all my builds so far, but i've started looking at web spinner for my Tundra build, but the initial 25% slow feels underwhelming. My question is, are upgrades additive or multiplicative? If it is additive, a tier 7 Web Spinner would offer a 55% slow, which is almost on par with the 59% provided by a tier 7 viscous tar. If it's multiplicative, i'll probably stay with the tar instead of wasting skulls on the web.