E=Eternal
S=Scracting
P=Power
But this is a guess

E=Extra
S=sharpness
P=power, like there esp SKILL, you get enough sharpness to penetrate monster hides and the
ESP in the item name Pyschoserum could mean like sharp senses, like for tracking

and the loser strikes again!

don't be annoying, please. this MHFU Q&A is quite clean of junks for sometime. better keep
it that way.

this is just a guess
e :extended
s :sensory
p :power
for tracking monsters with no paintball
get it with hunters armour like psycoserum