"Obsidian is indeed the best load-bearing stone for structures like the Dark Portal-permanent gateways between worlds that can accommodate entire armies. It conducts magic, resists the Twisting Nether, and is hard enough for the job," Sylvanas said as she walked. "But it isn't the only material suitable for building portals. Plenty of other materials will work, even ordinary stone or granite with a few magic arrays added. The differences lie in stability, reach, and lifespan. Aside from the basic materials, the power source and the caster's level also play a major role in whether a portal can sustain a connection between worlds. We don't need a Death Gate as enormous as the Dark Portal. We only need a stable gate the size of those two medium-sized ones you have, so this time I intend to build it with gold mithril and runes metal."
Sylvanas suddenly stopped. "There's something very important you need to do during this time. Build a railway from the cave near the Binding Magic Array and connect it to the railway leading through the portal to Valley Entrance Fortress. Clear out the supplies currently stored in that cave, then expand and renovate it."
"You want to build the Death Gate inside the cave?" Yu Lin Bloodhawk asked.
"Exactly!" Sylvanas said. "Only inside the cave will the Death Gate be concealed and secure enough. Besides... if something beyond our control happens in the Shadowlands, it will help us contain the situation within the smallest possible area. At worst, we can blow up the cave along with the Death Gate and crush any danger before it develops."
"Such a huge project?" Yu Lin Bloodhawk scratched his head. "The Valley of Trials is desperately short of workers already! There are construction projects underway all over the valley."
"The projects in