⇒ First off, you must indeed be a Warlock to translocate through the portal.
⇒ It requires great energy in order to keep the supply of electro-magic, which runs through a portal, stable and running smoothly. Any glitches can cause the portal to function incorrectly, causing either partial dismemberment, or movement to the wrong location.
⇒ More will be posted once other information is up.