I died for the first time today from Call of Bones skeleton form hp loss. Strangely it appeared that no xp had been lost as a rez did nothing. Did it again and verified it said pain and suffering attempted to strike me and missed twice then a You Died - with no xp loss message and my xp bar did not move. This certainly seems like a bug to me and googling didn't show any mentions of free xpless deaths from making that mistake on a necro so wanted to verify if this is a bug.
I don't believe this is a bug. From past self-death experiences, liching does not cause exp loss. It's just a pain to recover your corpse .
You should lose exp for dying to a DoT if you cast it yourself, or if an NPC casts it. [Wed Jul 17 22:34:35 2013] An Icy mist forms around you. [Wed Jul 17 22:34:56 2013] You died. [Wed Jul 17 22:34:56 2013] Ofossaa the Enlightened has been slain by Feared! [Ed note: the irony!] [Wed Jul 17 22:34:58 2013] Returning to home point, please wait... [Wed Jul 17 22:34:58 2013] LOADING, PLEASE WAIT... [Wed Jul 17 22:35:00 2013] Bothias is now the leader of your group. [Wed Jul 17 22:35:03 2013] You have entered Plane of Tranquility. [Wed Jul 17 22:37:47 2013] You regain some experience from resurrection. [Wed Jul 17 22:37:47 2013] You are being resurrected... [Wed Jul 17 22:37:47 2013] LOADING, PLEASE WAIT...