There’s something very interesting about having the player himself being the centre of an AoE effect. However, if it was a lethal suicide then the whole thing would be too binary. Players don’t really have a choice.
The concussion effect however, that’s different. The concussion effect should have a wide range and daze all hostiles as well as the player himself.
A short charge up time would be great as well. You can make this binary, so the player starts the sequence, he will start to glow so everyone is alerted of what’s going on and within 1 or 2 seconds the blast happens.
Even more fun is to make it a gradual ability. The blast wave and the strength of his ‘mind blast’ increase the longer he holds the charge. So it can go from a 1 second dud to a 5 second cataclysmic blast. Because the player will end up with a concussion and wasting his cooldown he will always be torn between getting a fast effect or a delayed strong effect.
Mind games.