Crystal Tether

Crystal Tethers would be a magical item that attacks the player. This would essentially be a crystal prism on a pedestal. When the player approaches it shoots a beam at the player. These can range from flames to debuffs and lifesteal. Its effect could be tied to different gems. Ruby for Lifesteal, Topaz for flames, onyx for blindness. This could be a good way to make dungeons harder. The crystal can give weakness or mining fatigue to prevent them from tunneling around challenging obstacles.