Actually Elena was extremely dissatisfied with this mission. She did not use any powers other than what a level 330 runic caster would be able to do. But still this whole mission was extremely easy for her. She did find anyone who was able to pose any challenge to her. Actually it was Elena's own fault.
While she was traveling in the flying ship, she was trying to create a few new methods of fighting with her runic caster job and she came up with a few good ideas. The current strategy that she was using was one such plan that she came up with.
It might look like she was sending the runes to her opponents at high speed but that was not the case. She was actually using a technique that any decent rune user should be able to use. That technique was called "Instantaneous Transmission". This allowed Elena to transfer an already ready rune to anywhere her eyes were able to see.