[skill]Death Nova[/skill] is the skill of choice for Minion Masters, usually this skill is cast upon the minions created with [skill]Animate Bone Minions[/skill]. There are several skills to explode those creatures.
But both applying Death Nova and exploding the Minions is quite clumsy due to having to click the Minion and having no minion interface of any kind. Basically, it is a targetting nightmare.
Heroes like Olias or Razah apply Death Nova very reliable, but telling them to blow up a Minion at the right time is "difficult" due to the same interface issues mentioned above.
Then there is the skill [skill]Putrid Explosion[/skill] that uses a corpse on the spot. It goes of from the corpse nearest to your target, but it has a very high miss chance and often goes of elsewhere, wasting a minion and going off without effect.
The easy-to-use solution:
The Putrid Horror
It is basically an afflicted creature, exploding upon death. Upon creation it heads straight for the nearest enemy target and immediately explodes in a Death Nova.
Basically, a homing bomb.
Icon: [skill]Putrid Bile[/skill] ... should be inspired by the putrid thing on the back of the poor guy...^^
Appearance/skin:

How about that:


Skill details: 15 Energy, 3 Cast, 10-15 Recharge
Disclaimer: I fear no new skills will be added to the game. So this idea is quite futile for GW1. Maybe GW2.
Or maybe someone at ANet has mercy and makes Bone Minions look like Bone Scarabs, like their icon, or replaces one of the least used Death Magic skills with it or just adds it as extra-content between GW1 and GW2.