Railroad Ink: Eldritch Expansion Pack

In the multiplayer puzzle game Railroad Ink™, your goal is to connect as many exits on your board as possible.
Each round, a set of dice are rolled in the middle of the table, determining which kind of road and railway routes are available to all players.

Use the 4 special dice of the Eldritch Expansion Pack in addition to your regular Route dice, and find new ways to score points:

Ritual (1 die): open new Portals and add mysterious Rituals to create a Madness Network!
Portal (1 die): open different supernatural Portals to connect distant areas of your network!
Tentacle (1 die): extend Tentacles along your network as much as you can to get bonus points for each space occupied!
Investigation (1 die): send your Investigator to collect Clues to solve the case and gain extra points!

Note: at least one core set of Railroad Ink™ or Railroad Ink Challenge™ is required to use this expansion pack.