This change reduces the damage that the green, watermelon-looking
"Creature" mobs are capable of.
Previously, their attacks had a damage range of 20-50. For comparison,
Plains Tyrant and Cavern Geist do 40 damage an attack.
The Xenoarchaology item that spawns these green dudes seems to be
capable of spawning them pretty quickly - and when you're fighting
simple mobs that are able to break your bones and give you an arterial
bleed in a single hit, that gets silly pretty fast.
I've tweaked the damage numbers so that the Creatures are a little
stronger than Hivebot Guardians in terms of damage.
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