this datapack add in Elder of The Ender Origin.
+plus side:
enderpearl throw (primary)
shulker box inventory (secondary) (keep the stuff in the shulker box inventory when die)
fullbright
boost in the end
15 hearts
-negative side
take water damage (rain and water)
stinky (particle)
when enderpearl ability is used you get slowness
things that can change/add:
more weakness
balancing