@magpi You appear in the circle, they're taller than you. Then comes the dwindling. Maybe you manage to stand up and smile down at them. The writing isn't visible on your shirt yet either.
They panic, trip, and then they see it, the horns, and paws/talons bigger than they are.
could be worse. If a couple summoned you, you take the small one as a toy and have fun with whoever remained big.
@magpi They do some evil-villain stuff. The summoning circle is under a city, painted through their sewers. They aim to summon you as big as possible, and sacrifice the city.
On the one hand, that city was already a write-off.
On the other, the cult's not gonna survive either.
Maybe you pick the sacrifice instead of them. Shrinkthem to nothing and keep the city as your toy, for however short-lived it is.