[Just the beta version right now I may change the later Tier levels, and a small spoiler warning as it could SPOILER some content!]
+ choosing a build gives a title with the appropriate stat boosts/nerves.
Evolutions every 10 levels
[Tier 1 Level 0-20] (Tier one is the "grow up" phase)
Level 1: first evolution
Level 5: second evolution
Level 10: choosing the first specialization (job class for monsters)
Level 20: third evolution
[Tier 2 Level 20-40] (Tier 2 is the "consciousness" phase)
Level 30: fourth evolution
Level 40-second specialization
[Tier 3 Level 40-80] ("Stagnant" phase where exp gain is drastically slowed down as exp boosting won´t take effect anymore and killing lower tier monster will give you close to 0 exp.)
[Tier 4 Level 80-130] ("Recrutement" phase there most monsters get noticed by major factions and groups of interest)
Level 100: Refinement (restructuring/fusion and scrub organs)
[Tier 5 Level 130-190] ("Rebellious" phase, most monsters start to form their own kingdoms/groups/army in that phase of life)
[Tier 6 190-260] (start of the big leagues)
[Tier 7 260-330] (Walking catastrophe)
[Tier 8 330-420] (natural disaster)
Level 420 Purge all impurities
[Tier 9 420-???] (Ascension?)