thx Holybird. I recall encountering them in Chains of Flame as castings by enemy gnolls. I found them really annoying and they followed me about. So I thought, why not do that also to them? Though I figured it out on my own, I am not the first. In another thread on stealth builds, some players have revealed knowledge about them.
Thanks psykopeta! I encourage you to check out Spencerian's guide in my sig. I am trying to add to it, just haven't had much solid playtime. I recently had to abandon a PUG 30 minutes into Let Sleeping Dust Lie. It was a shame, since I was having fun assisting a well-played assassin there.
Hah! The use of summons is actually used in that way too. Ghoste championed it in his videos--he used the celestial dog as his sacrificial pet. He would use it to distract enemies or move them closer to each other. He was able to cast the dog right where he wanted to do so.
I use them too--I keep a Roderic's Wand on my hotbar for summoning a variety of little sacrifices, depending on the situation. I think they might cause an alert with the scorpion in Claw of Vulkoor, but I am not sure. They can be used in tandem with flaming sphere. One of the advantages of flaming sphere is that the mobs walk very slowly to check it out, whereas the dog will get attacked aggressively (and usually die quickly). So both work, just depends on circumstances.
For example, at the entrance of Running with the Devils, I cast a flaming sphere and ran ahead of it to the first gate switch by the archons. The archons eventually finished their dialogue, and around that time the flaming sphere began to rumble towards them. So they lit up and attacked it, running past me (I was invisible and in stealth). Then it was easy to proceed. No good guys got hurt, except some minor burns! (Not counting all my deaths on several failed runs)
I have attempted to plop several spheres in the nasty final air elemental mess of Fleshmakers. The air elementals sometimes get aggro on the spheres and give you a break. Not the best way, but helped.