The Transfiguration spell Comletia was taught during Term 27 by Professor Isabelle Magnus. The spell allows the caster to transfigure a watch into a working compass. To cast the spell, the caster should focus on what they want the finished product to look like. More complex transfigurations require greater amount of concentration. The compass can be turned back to a watch with a Reverto.
The incantation is Comletia. The wand motion is a small cross shape, top to bottom then left to right, followed by a tight circle and a jab at the watch. The motion should be continuous and fluid until the jab.