Ascend Hand of Kul

In the crusade tab of the menus, you can choose to ascend your caos warrior every 5 levels. So go ahead and do it as soon as you hit level 5. Your character will become an AI instrument of your chosen god to be sent to take control of other players' shrines and alters. The level cap will be increased by 5, you get a boon for all your warriors, and you will lose 50% of your XP but you have an opportunity to "legacy" an item to use on all your future caos. You can also purchase an additional legacy pillar for 1000 souls and each successive one is doubled in cost (2k, 4k, 8k, and so on). I would highly suggest putting any and all spells on the pillars since they cost many souls (level 1 is 15k, level 2 is 50K!).

As far as legacy goes, I suggest only using the pillars for equipment. Any spells you have equipped automatically are made legacy and once any item or spell is made legacy it is always in you inventory unless you sell it. I have 6 spells and never had to put any on a pillar as I swapped one out mid play.