Bubba's Abberant Sentinel

You touch the realms beyond human cognition to conjure part of it as your loyal watchman. As a part of the spell you summon tiny seed wich you plant upon the surface. The surface can be ground, stone or wood, but not artifitialy constructed.When you plant the seed, you can choose up to ten creatures that can pass through the plant area without triggering it, or a simple condition (for ex. red ribbon on the right shoulder, left hand  rised in the air), or a command word, which would also prevent the plant from waking up. Within 10 minutes seed grows into a small plant, wich resembles common plant from local surroundings.On a closer look, it is covered in a small closed eyes and mouths, or other abberation features. It can be distinguished from a normal flora by analysis or nature check (DC is your spellsave DC). When the plant is fully grown, anyone who comes closer than 30 feet to it, wakes the plant up, and after 6 seconds it is starting to make high-pitched screaming noises. Anyone in a 30 ft radius area must make a Wisdom saving throw. A target takes 3d6 psychic damage and is stunned for 1 minute on a failed save, or half as much damage on a successful one and not stunned. On a succesful save target is also immune for the stunned condition from this source for 24 hours, but still takes psychic damage.

The plant has AC 13 (natural armor), 20 HP and can be dispelled or banished.

At Higher Levels.

If you cast this spell using a spell slot of 5th level or higher, you can plant more than one plant for each slot level above 4th.