(You really are trying to push for the battle before even Halloween arrives, aren't you...well, sometimes the simplest solutions are the best)
The Master and the Shadow Umbreon, while preparing a new circle, noticed the shifting ground while the former also sensed the approaching of the intruder.
"Looks like the bastard thinks he can assault us directly. Alright then..." The Master conjures up a spell, encasing the chamber and surrounding area in yet another shell. This one is much simpler and, thus, completely invisible to even the most sensitive magical detection. It's effect is simple: Anyone who enters it in any way, shape or form is put into a trance, the same one the Glaceon and Dewott are in. Those already inside are unaffected.
"And, just to make sure..." the Master places a rune on the ground where the Pentagram had shifted. It's effect was simple: First thing to step on it would become paralyzed. A nasty paralysis that prevents damn near all movement or action. Finally, just to make sure, the Master uses an enchantment on himself and the Umbreon, making them immune to any runes, to avoid any accidents.
(K_H?)