Update 1.10.6.0: Behold The Beholder!

Configs older than 1.10.6.0 will be reset!

New Mountain Mob Added: Beholder
New Items Added: Arcane Laser Storm Scepter/Charge

New Stat: Pierce, this stat is configurable like the other stats and
affects how some attack damage ignores armor.

Improvement: Mobs spawned from World Events will despawn when a new
event has started, this will now include mobs that have been in unloaded
chunks whilst the events have switched, etc too.
Improvements: Mobs spawned from events are given a 10 minute timer
before they despawn, if they are unloaded, this timer wont tick however.
The Timer can be configured on a per event basis too.
Improvement: Greatly lowered the rate, chance and count of the Sky Spawn
Type's defaults, this should greatly reduce the amount of flying mobs
that are spawning. Note: Jengu use the Water Spawn Type so will be
unaffected by this.
Improvement: The Rock Spawn Type's (Geonach's) block breaking radius has
been lowered and is now configurable.
Improvement: Infected Conbas will now explode after a minute into a
swarm of Vespids!

Bug Fix: Fixed a ranged attack speed issue that has been around for a
very long time making ranged mobs attack much faster than they should
have been.
Bug Fix: Piercing damage will no longer ignore the damage cooldown that
entities have (the damage cooldown limits how many times an entity can
be damaged per second). This should especially stop rapid fire mobs like
Cinders from doing far too much damage!
Bug Fix: Stat Boosts should now work in the ExtraBehaviour NBT system
for other mods or NBT editors to use.
Bug Fix: Vespid Queens should now respect their minion limit instead of
spawning infinite minions! They were checking for other Vespid Queens
instead of Vespids, oops!
Bug Fix: projectiles will no longer collide with their throwers, this
should stop large mobs from sometimes absorbing their own projectiles
before it has a chance to be fired.