gacha

It is a noble phantasm at the level of magic, that completely shuts out all physical interference, transliners from parallel worlds, and communication from other dimensions (up to the sixth)

After invoking its true name, Avalon dissipates as tiny particles into the air, and shields the wielder from all interference. No damage can be done to the wielder when a state of absolute defence is initiated. Even interference from the parallel world based on the Second Magic will be blocked. An “absolute defence” that can even repel the assault of True Magic, it is a True Magic in itself.