Some great stuff here; few things I noticed.
1) the shark zombie spams errors and I have to alt f4 (I didn't look too much into it)
2) The explosion particle index for the juggernaut's rockets are set to be exploding cars. I think maybe you want the regular explosion?
<item name="JuggernautProjectile">
<property name="Meshfile" value="#Other/Items?Weapons/Ranged/RocketLauncher/rocketPrefab.prefab"/>
<property name="Material" value="Mmetal"/>
<property name="CreativeMode" value="None"/>
<property class="Action1">
<property name="Class" value="Projectile"/>
<property name="DamageEntity" value="125"/>
<property name="DamageBlock" value="1000"/>
<property name="Explosion.ParticleIndex" value="4"/><------4 has cars exploding as part of the explosion. 5 is the normal rocket boom.
<!-- which Prefab/particle is used -->
<property name="Explosion.RadiusBlocks" value="5"/>
<!-- damage radius for blocks -->
<property name="Explosion.RadiusEntities" value="4"/>
<!-- damage radius for entities -->
<property name="Explosion.DamageBonus.water" value="0"/>
<property name="Velocity" value="18"/>
<property name="FlyTime" value="2"/>
<property name="LifeTime" value="4"/>
<property name="CollisionRadius" value="0.75"/>
<property name="DamageBonus.earth" value="0"/></property>
<effect_group name="JuggernautProjectile" tiered="false">
<passive_effect name="ModSlots" operation="base_set" value="0"/>
<passive_effect name="DamageModifier" operation="perc_set" value="0" tags="earth"/>
<passive_effect name="DamageModifier" operation="perc_set" value="0.5" tags="stone"/>
<passive_effect name="DamageModifier" operation="perc_add" value="1.2" tags="metal"/>
</effect_group>
</item>
3) Was looking for the sound played for scorcher b/c when I killed him the sound remained attached to that spot, even after the corpse was gone. This is usually the case with the looped .wavs.
4) Maybe make the cowhead dude bigger so the skull doesn't look like a kid wearing his dad's hat which is too big.
I had my own banshee that flew and screamed; I'll share when I'm finished. I think a banshee's weapon should be a scream which stuns the player and that the banshee should fly!
Love the ingenuity from you guys.