She was responsible for the destruction of Mesaana only through her use of Slayer. This information doesn't clear up whether she personally killed Asmodean or if she ordered someone else to do it.
It says so straight out in the glossary of ToM. "Graendal: A ruthless killer, she was responsible for the deaths of Aran'gar and Asmodean and for the destruction of Mesaana."
Epilogue: Graendal-Lanfear
- 31/01/2011 05:05:13 PM
1887 Views
Graendal killed Asmo
- 31/01/2011 05:53:50 PM
1114 Views
Re: Graendal killed Asmo
- 31/01/2011 05:57:09 PM
1304 Views
Brandon Sanderson stated outright that Graendal did it by her own hand
- 31/01/2011 06:24:36 PM
1238 Views
Can you produce a link to verify? cuz the glossary is vague *NM*
- 01/02/2011 02:21:51 AM
505 Views
BS said before the book was released that we would find out who Asmo's killer is. *NM*
- 31/01/2011 06:08:48 PM
484 Views
Very boring!
- 02/02/2011 09:50:52 AM
1021 Views
Particularly since it would require Moiraine to be free of the Three Oaths. 
- 02/02/2011 05:25:01 PM
862 Views
- 02/02/2011 05:25:01 PM
862 Views
Re: Epilogue: Graendal-Lanfear
- 05/02/2011 12:04:10 AM
1084 Views