Razor Wire

Razor Wire is a transparent, semi-tangible block added by Immersive Engineering. When an entity, including the player, walks through or touches the block, they will be slowed for the duration of contact with the wire, as well as taking damage each half-second. The amount of damage received depends on if the entity is wearing leggings or boots. If the entity is not wearing leggings or boots the damage will be 1.5, if wearing one of those armor pieces the damage will be 1, and if wearing both the damage will be 0.5.

Razor wire can be electrified by connecting it to a low-voltage power source via an LV Wire Coil, which will slightly increase the damage output of the block. Powering it with a redstone signal will make the "spikes" disappear, which could possibly stop the block from dealing damage [research required]