5E D&D Gamma World Monster: Cal Then
 
 This is the latest entry in a series of creatures I converted for Fifth Edition Dungeons & Dragons to be used in my son's new Gamma World hexcrawl campaign. You can download all 150+ monsters here
This flying insect is 2.5 meters long. 

The intelligent cal then can attain a length of 2.5 meters (8 feet). It has huge mandibles that can do massive damage and, given time, crush even duralloy. It is attracted to bones, which are its favorite food. It carelessly rips the flesh off living creatures merely to devour their bones. The cal then is completely resistant to all heat and cold attacks.

Cal Then

Large   beast (mutant)

Armor Class 11 (natural armor)
Hit Points 27 (6d8)
Speed 20 ft., fly 20 ft. 

STR | DEX | CON | INT | WIS | CHA     

14 (+2) | 10 (+0) | 10 (+0) | 13 (+1) | 18 (+4) | 4 (-3)

Damage Immunities fire,   cold

Senses darkvision 60 ft., passive   Perception 14

Challenge 1/2   (100 XP)

Ripping Bite. Melee Weapon Attack: +4 to hit,   reach 5 ft., one target. Hit: 8 (2d6 + 2) piercing damage. In   addition, nonmagical armor worn by the target is partly shredded and takes a   permanent and cumulative -1 penalty to the AC it offers. The armor is   destroyed if the penalty reduces its AC to 10.

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