Are we getting pet evolution? It was recently introduced to kRO. Some pets can be evolved by bringing certain items to an npc.
Peco -> Grand Peco
Orc Warrior -> High Orc
etc.
Also a couple of months ago kRO got special monsters. Each map has special version of the normal monster, it's like a mini-boss, like super lunatic, super poring, etc. They have better stats, skills, increased drop rates and give much more xp.
Edited by Cami, 24 November 2014 - 06:11 PM.