This spell is used to enchant a gate or doorway, usually a massive stone arch that must be carved with the images of winged fire demons and the sun before the spell will function. The spell is then cast 5 times on 5 days, not necessarily consecutive. Each casting imposes 1 burden, and costs Wealth 14's worth of burning woods over the 5 castings.
Once the enchantment is complete the gate will be so enchanted that anyone who knows its commanding invocation, and speaks with the authority of whoever commanded the spell to be cast, can activate the gate's defences. This causes the gateway to be filled with a field of burning light that does 4D10+5 damage to any object that attempts to break it. In addition it surrounds the outer face of the gate with a lesser field of burning light whose heat is enough to slowly melt bronze (this does not affect the gate or anything behind it) and which inflicts 2 damage per round on any who come within 20 strides of it.
Solar Gates defend each of the major entries of Ur, and the landwards gates of Derzak. Few other places bear such enchantments.
power+1 damage or +1 stride of outer effect per Power Level