User blog comment:Crimson and Darkness/Volume 25 discussion blog/@comment-28626666-20180501073648/@comment-26285797-20180501163928

Purely theory, but it may have to do with TL's Truth Idea, stated to be the dying will of Yahweh (God of the Bible) sealed inside the spear. According to the LN, it is similar yet different from the Juggernaut Drive that BG and DD have. Again, this is speculation, but it seems that unlike the other Longinuses, TL can easily kill gods from first use, without the need to train it. I wager that it can only kill low-level gods and needs to be mastered to kill the top-level gods of the world. As for Truth Idea, it is said to be able to bless TL user's opponents with a power to charm them into becoming allies, or destroy them. I really don't know, that statement could just hyperbole used as part of the TL's lore, but I'd like to think it could.