Lower Level Mobs killing any mob level 13 or lower will give 0 XP. ... For a level 18 mob, we have XP = 145 * (1 - 2/11) = 118.6 rounded to 119 XP. For a level 16 mob, we have XP = 145 * (1 - 4/11) = 92.3 rounded to 92 XP. For a level 14 mob, we have XP = 145 * (1 - 6/11) = 65.91 rounded to 66 XP.