These cutoff points will form the basis of how I plan out the level of Kairos.
Level 11 - All the fragments (used to unlock new spells and spell passives) Level 10 - Hidden in Time (2 uses, stalk and unspottable for a decently long time) Level 7 - Invulnerable through Fate (10% missile resist) Level 7 - Gaze of Fate (3 uses, -40 MA single target hex, hard snare) Generally speaking you take them when they become available, but there are many ways to go about it, especially with Kairos. For most legendary lords there are certain skills gated behind specific levels, mostly so they don't become too OP too quick.