Not necessarily the animal, but the deadly Sin.
Since it is Sloth, the starting attack speed will be slow (5-8) with attack range of 1.
Ability 1: Know No Diligence
Gain 0.5 exp every 5 seconds. At level 99, gain 100% attack and critical damage.
+0.1 exp per level
Abiltiy 2: Technology Savvy
Item bonuses increase by 10%
+1% bonus per level.