Technical blocks are blocks in the Aether II mod that cannot be acquired without commands or mods, but have independent block IDs, and serve various purposes during events within the mod.
Aether Portal blocks are generated when a portal is formed, and standing in them will teleport the player from the Overworld to the Aether and vice versa.
As Aether Portal blocks follow the behavior of Nether Portal blocks, please see Nether Portal for further information.
In the original Aether mod, Aether Portal blocks used to have the same atmospheric sounds that Nether Portals have.
Coldfire blocks are generated when Tempests attack with their Frostbite projectiles. Coldfire will generate on any blocks that is hit by their Frostbite projectiles. Coldfire does not harm the player but gives Slowness III and cannot be extinguished without removing its supporting block. They do not spread and disappear quickly.