Yor global enchantment was overpowered..????

[GriffinOfBuerrig]

Yor global enchantment was overpowered by the existing global entchantment and failed to take effect.

I do not understand this what happened??

[Psitticine]

There can only be 5 global enchantments active at one time. When you (or somebody else) tries to cast a 6th one, one of the existing ones is selected at random and its power is compared to the power of the new spell (i.e. the number of gems used in their casting are compared, which is why it can pay off to put extra gems into a spell). If the new spell is stronger than the old, the old one is dispelled and replaced by the new one. If the old one is stronger, the new one fails and you get the message about it being overpowered by the existing global enchantment.

[magnate]

This can also happen if you try to cast a global that someone else has already cast - yours has to compete with the existing one, and may fail.

[GriffinOfBuerrig]

Ahhh, thank you! Great to know!

[Ballbarian]

one of the existing ones is selected at random and its power is compared to the power of the new spell

What if 4 global enchanments belong to you, and the 5th one belongs to an enemy. If you cast a 6th global, will it automatically attempt to override the enemy global, or is there a risk of overriding one of your own globals? In my current game, I have hesitated to cast another global for fear of killing one of my own like this.

[Cainehill]

Pretty sure I've taken one of my own out before, so - the odds seem 4 to 1 that you'd take out one of your own.