The dwarves of Anbri still speak this language, but it is dead on every other continent. Even so, runes are used by the Evercrest dragon riders on their dragons, clothing, and weapons for a variety of reasons. Dragons are capable of having up to ten runes cast upon them to bind them to their rider and a nearly-unlimited amount of runes for their magical function. Runes that bind them to their rider take energy from themselves when activated, but the runes used to enhance their magic use little to no energy from dragon or rider since they're just a means of channelling energy that is already there in a way that's easier for the dragon. Their main rune is cast on their forehead and it glows when the dragon uses magic. The main rune is the rune with the most power for the dragon and it can either be a binding or magic rune. The other runes glow when their power is being used. The glow's color depends on the element that the dragon's mage controls, along with the type of magic that they use. The only exception to this rule are necromancer-cast runes; necromancers' runes always glow black.
Dragon runes do not have an immediate effect unless they are binding runes. The dragon's body has to adapt to the change, which can take from hours to years depending on what the rune's effect is. Binding runes are the only runes that can be cancelled out by other runes. Some runes affect both dragon and rider, which means they both will be forced to adapt to the change. The physical, mental, and magical strength of the dragon (and rider, if it affects them both) will determine the amount of time it takes for a rune to take its full effect. Dragon runes can also be inscribed into a humanoid and the same rules apply to them.
Runes on clothing and weapons act differently than on dragons. Clothing, depending on the material, can hold anywhere from zero to five runes. The runes on clothing are different from dragon runes and are only used to enhance its armor property or enact some kind of magic upon the wearer. Since clothes don't have an energy of their own, the energy for the magic is drawn from the wearer. The same goes for weapons, but their runes are different as well. Their runes are for elemental attacks and for making the weapon more balanced for the user. The amount of runes that can be inscribed on clothing or weapons is unknown until the number has been reached- at that point, the weapon or clothing will turn to ash.