The Ash King ha faced off against the Undead King and came out on top, even if the later was facing two opponents at the time, it just told Dave that the creature of flames was a one of the giants of the world of Conquest, and giants couldn't be slain with meager, unthought of methods.
Although the bolt was dangerous, the task of him hitting the Ash King with it was more cumbersome than it would seem to any other person.
He didn't really know what the Ash King was fully capable of. Naturally, if he could pull off such a stunt, it would be a great achievement and would most likely end the war between the Undead and the Demons right then and there… yet the risk of him failing was too high. However, Dave wasn't an irrational person.
He had already successfully used it against the Ash King's Chosen One and he was currently very tempted to use it against the great demonic abomination that was chasing him right now. In his hand was the bolt that could literally slay gods. He was not worried, he was not frightened, but he sure was excited. Fire hurled at Dave from everywhere, and the player ran, sprinted and vaulted across rocks and boulders with grace never seen before.