Firebolt has so much range that it's really hard to miss. If you put around 40 damage into someone, toss a Viking funeral firebolt somewhere near them, they will die. If they don't die, you have around 10 seconds to put one shot of damage into them, then they will die. It's currently too strong right now. Yes, it takes up 2 perk nodes, but you aren't giving up much. You are giving up either a few seconds more of radiance and a chance to generate an orb on a scorch kill, or angel of light. The only perk that you are giving up is the double grenades. But if you toss two firebolts and they both hit the same person, it does around the same damage as a burning one. But you have to take the time to throw a second grenade, and you don't get damage over time. If you want to read a rebalance I made about warlocks https://www.bungie.net/en/Forum/Post/194918055/0/0 here it is. It's not one of those "nerf warlocks now" kind of posts either