Fast & Easy Monstrosity Levelling Guide

1-13 West Ronfaure. Very simple, start near town and work your way south, killing anything Easy Prey-Decent Challenge for the fastest EXP/min.
13+ Buburimu Peninsula. Set yourself to Belligerency (PvP mode on, by talking to Aengus in the Ferocity), and activate the following Records of Eminence: 
* "Conflict: Buburimu Peninsula" Under "Combat (Region)" >>> "Combat (Original Areas 3)"
* "Spoils: (Earth Crystal)" Under "Combat (Wide Area)"
* "Spoils: (Fire Crystal)" Under "Combat (Wide Area)" 
* "Spoils: (Lightning Crystal)" Under "Combat (Wide Area)" 
Start near the Outpost and work your way east killing the easiest mobs you can find. Killing Easy Prey mobs for around 300exp/kill is by far the fastest EXP/min ratio when combined with the Records of Eminence. Most MONs by level 30 will kill Easy preys in this zone in 2-3 hits. With the RoE's set, you will gain an extra 600 EXP for every 10 kills in the zone, as well as an additional 1,000 EXP every time you obtain 10 of each crystal. For the best EXP/min, try to pull several mobs at once & use any AoE abilities/spells you have to kill several at once.
The zone is level capped at 30, meaning the mobs to the east will always stay Easy Prey all the way to Lv.99. Additionally, since you have PvP mode on, you can go passed the normal 10,000 Infamy cap, allowing yourself to earn NM(10,001-20,000) or HNM(20,001-50,000) which increases the amount of HP & Instinct points you can allocate.