Did Ultear know there was a different way to defeat master Hades?


In episode 116 after Ultear lost the fight with Gray, she tells him that he
cannot beat Hades, but does not tell him anything about Hades' weakness (eg:
his heart).

![Ultear telling Gray there is no other
way](https://i.stack.imgur.com/BFXo1.png)

This seems weird since when she had Zeref a couple episodes back, she was
about to stab Hades in the back and take Zeref for her own purposes. This
would imply that she was no longer on Hades' side.

Later we see that the guards knew that the room Hades' was in was something
they could not lose control of.

![Lilly versus guards](https://i.stack.imgur.com/2f0RF.png)

Since the guards knew about this wouldn't Ultear know this as too, seeing as
she was pretty much raised by Hades?




Urtear did know for sure. She had been trying to deceive Gray all along. She
told Gray that the Iced Shell was the only way because the spell traps the
caster as a shell of ice for all eternity. She wanted him to die because she
thought Gray was the one responsible for her mother not loving her which was
not true at all.

Urtear knew more about Hades than any of the outsiders. She obviously had a
plan to kill Hades herself but having Gray kill him would be killing two birds
with a single stone.

But Gray realizes that after he over hears her and sees her trying to kill
Juvia.

