Talk:Book of the Dead/@comment-45.56.46.26-20180522225750

The section which Ainz (randomly?) selected to read to Fluder about the transformation of the dead into souls seems to have significance for both Wild Magic (the province of the Dragon Lords) and for the use of certain XP draining skills and supertier spells, specifically [Wish Upon A Star].

In other words, the ability of tier magic casters to accumulate and use mana should also be related to such things as the amount of XP that can be gained from kills as well as through other methods.