Here are a couple of snippets from the longer log. Get a group, have someone else attack the guildguard, and it can't be targetted with any spells, apparently. This goes for using just "cast spell healer" or for "cast spell" while already fighting it. Forked lightning is shown below, but other similar damage spells failed in the same way. Got the echo, no damage.

Ghrovash utters the words, 'noselacri'.
The elven healer yells 'Help! Ghrovash is attacking the guild!'
The elven healer's kick wounds Ghrovash.

|400hp 350m 425mv 10505tnl (7.85%) 12 AM indoor civilized|
Ghrovash's crush DISMEMBERS the elven healer!
Your crushing force misses the elven healer.
The elven healer parries your crushing force.
The elven healer has a few scratches.

|400hp 350m 425mv 10505tnl (7.85%) 12 AM indoor civilized| c adhe heal

The elven healer closes her eyes with a look of concentration for a moment.
A soft golden light shines from the elven healer's wounds.
The elven healer is in perfect health.

|400hp 350m 425mv 10505tnl (7.85%) 12 AM indoor civilized| Sweeping both arms forward, you hurl the sticky strands of a web at the elven healer!
The elven healer is in perfect health.

|400hp 325m 425mv 10505tnl (7.85%) 12 AM indoor civilized| Khabr tries something fancy with his swords, but blunders it.
Khabr's thrust misses the elven healer.
Khabr's thrust misses the elven healer.
The elven healer is in perfect health.

|400hp 325m 425mv 10505tnl (7.85%) 12 AM indoor civilized|
Ghrovash utters the words, 'unsozfol egruui'.
Ghrovash's energy drain grazes the elven healer.
The elven healer has a few scratches.

|400hp 325m 425mv 10505tnl (7.85%) 12 AM indoor civilized|
The elven healer's slice wounds Ghrovash.
Ghrovash's crush MUTILATES the elven healer!
Ghrovash's crush DISMEMBERS the elven healer!
The elven healer has a few scratches.

|400hp 325m 425mv 10505tnl (7.85%) 12 AM indoor civilized| l
A Corridor Leading to the Healers' Quarters
This austere corridor leads to the chambers set aside for the use of
those priests whose granted powers lie in the care of others. The
foyer of the Temple lies to the south, and the healers' quarters
lie east.
|400hp 325m 425mv 10505tnl (7.85%) 12 AM indoor civilized| mutter
You mutter quietly to yourself.
The elven healer has some small but disgusting cuts.

|400hp 325m 425mv 10505tnl (7.85%) 12 AM indoor civilized|
Ghrovash utters the words, 'unsozfol egruui'.
The elven healer narrows her eyes and glares in your direction.
You are surrounded by a pink outline.
The elven healer's slice mauls Ghrovash.
Khabr's cleave EVISCERATES the elven healer!
Khabr's cleave EVISCERATES the elven healer!
Your crushing force misses the elven healer.
Ghrovash's crush misses the elven healer.
Ghrovash's flaming bite devastates the elven healer!
Ghrovash's flaming bite maims the elven healer!
The elven healer is covered with bleeding wounds.

|400hp 325m 425mv 10505tnl (7.85%) 12 AM indoor civilized| c 'forked lightning'

Khabr tries to strike the same place with both his swords.
Khabr's thrust MASSACRES the elven healer!
Khabr's thrust MASSACRES the elven healer!
The elven healer is covered with bleeding wounds.

|400hp 325m 425mv 10505tnl (7.85%) 12 AM indoor civilized| A bolt of forked lightning shoots forth from your hands!
The elven healer is covered with bleeding wounds.

|400hp 295m 425mv 10505tnl (7.85%) 12 AM indoor civilized|
The elven healer's slice wounds Ghrovash.
The elven healer's kick mauls Ghrovash.
Khabr's cut DISMEMBERS the elven healer!
Khabr's cut DISMEMBERS the elven healer!
Khabr's cut DISMEMBERS the elven healer!
Your crushing force mauls the elven healer.
Your crushing force misses the elven healer.
Ghrovash's crush EVISCERATES the elven healer!
Ghrovash's flaming bite devastates the elven healer!
The elven healer is gushing blood.

|400hp 295m 425mv 10505tnl (7.85%) 12 AM indoor civilized|
The elven healer's slice injures Ghrovash.
Khabr's cut DISMEMBERS the elven healer!
Khabr's cleave EVISCERATES the elven healer!
The elven healer parries your crushing force.
The elven healer is gushing blood.

|400hp 295m 425mv 10505tnl (7.85%) 12 AM indoor civilized| c 'forked lightning'
A bolt of forked lightning shoots forth from your hands!
Ghrovash utters the words, 'unsozfol egruui'.
The elven healer is gushing blood.


|400hp 299m 436mv 10505tnl (7.85%) 1 AM indoor civilized| c 'forked lightning'
A bolt of forked lightning shoots forth from your hands!
The elven healer is writhing in agony.

n/t