Diamond spikes are structures that act as walls that inflict damage to all players upon contact, except to whoever placed it and his/her teammates. Spikes will also inflict a small amount of damage on players who attack it, even if they are out of range of the actual spikes. When placed, mobs/players can't walk through it, which is very useful when running away from an attacker, or building a base. Diamond spikes can only be broken by hammers or amethyst tools. Hammers are generally faster at breaking diamond spikes than amethyst tools.