The Sentinel Blaster is an energy-based weapon that fires slow moving bolts. This gun is good if you have just started the game as you only have to log in for 15 days I think (I logged in one day to find out i had it) and you will get it free. As I said earlier it is free so you will see quite a few noobs running around with this thing trying to kill someone. This gun is not really a weapon you want to upgrade loads of times but is quite good at close range (no good at long range).