Portal
A portal is an entity that allows instant travel to and from the town in the act where it is created, or the previous town if the current town is unvisited. A portal can be used many times however will disappear when the creator uses it to from the town-side.
Portals will automatically disappear after the instance they are linked to has expired. The expiration time for instances is 8 minutes for normal instances and 15 minutes for "hub" instances (instances that lead to more than one instance. Ex : Mud flats that lead to Fetid Pool and Submerged Passage). A portal will not expire as long as the instance it is linked to is prevented from expiring.
Two items allow the creation of portals: Portal scrolls and 
Portal gems.
Portal scroll
Portal scrolls are single-use items. They can be dropped by monsters, found in various containers or bought from NPCs for 3 Scrolls of Wisdom.
Portal (gem)
The Portal Gem is a very rare drop-only gem. It is a colourless gem and can be placed into any item socket. Every 1% Quality adds 3% Increased Cast Speed.
