The hero will get stunned. Only heroes can be stunned by Spiked Carapace. On one hand it's funny if you use an SC'd Nyx to kill a lvl 3 Melee Necro creep the kill damage goes to the Necro owner. On the other hand, it's completely useless against Warlock's Golems.
Ragnarok: Tetra Vortex Warlock :3 "My scouter broke. The awkward level is off the charts." - nickcool1996, accurately describing Miyako Hotsuin.