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There are two methods of handling this particular puzzle that will allow you to take the chest without damaging your group. Also the severed heads are the remains of the group that built the Gargoyle Maze that we will encounter later on. This will destroy all of the heads and make leaving this area a little bit annoying. Turns out the chest is trapped and the bulbs around the area will explode in a variety of elements if you open the chest.
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You should speak with the heads to find out exactly what is going on. There are several severed heads surrounding a chest with a bunch of incinerated corpses and dead magisters littering the area. This is one of the more amusing situations in the Hollow Marsh.
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