So, let's say you are a level 7 kobold cleric with the Artifice (Traps) and Runes (Language) subdomains. You are leading a group of kobolds that are mostly snare setter and underground chemist rogues with a few construct guardians to boot. Your lair is a series of tunnels underneath an old keep built by humans that your people drove out from below maybe 75 years ago. It is heavily trapped with more mundane options like pits and poison and deadfalls and what have you, but you want to add a little more.
You have access to glyph of warding. The blast rune has obvious uses. What are the best options for the spell rune version? Is there anything better than bestow curse? That's really nasty, but also feels kind of boring. I liked the idea, briefly, of murderous command, but the short duration means it's probably just an annoyance at best. Any other ideas for protecting your hellish (to invade) kobold lair?
Deeper Darkness is surprisingly good. It's boring when darkness stops actions, and it's even worse when it radiates from you. Not even darkvision will save you.
Prayer is also offensive. The enemy now it's your new party buffer/self-debuffer.
Vampiric Hunger either damages constitution (not the first target) or make the latter exhausted.
Trial of Fire and Acid deals 14d6 over 7 rounds at your level. Not bad if time is not a concern.
Irradiate, read it as *Mass Drain Constitution*. Seriously, this is a wonderful spell.
Animate dead. After the first trap, someone dies. After the glyph, you have a small army of what tried to kill you.
Aboleth's Lung. The first SoD spell. Very very slow.
Blindness/Deafness is a classic long-term effect, Disfiguring Touch is a day per level with effects like Bestow Curse and a hideous disfigurement, Sands of Time is short term but probably long enough to make someone turn back for a while at least.