Forging Haven pack gives rare material for the monsters Blackwing (Glowing Eye), Mecha Trojan (Ancient Blueprints) and Mega Maggot (Corrosive Toxin).
This rare material is useful for making monster gear in the game. The pack also gives monster chests & some speed ups.
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Forging Haven Expanded Pack

Forging Haven Pack Full Rotation
The pack is available only for $10 and can be purchased just once per rotation.
Is Forging Haven pack worth buying?
Rating : 3/5
Forging Haven gives 72 Glowing Eye, Ancient Blueprints and Corrosive Toxin for $10. These are rare materials from the monsters Blackwing, Mecha Trojan and Mega Maggot respectively.
Although not a bad value, I like this pack a little less, because the materials given here are relatively easy to obtain and required in lesser numbers.
Before you Go
Let us know if you think gear from these 3 monsters is worth upgrading and which other material pack you think is useful in the comments below.