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  Martial Archetypes 
  Different fighters choose different approaches to perfecting 
  their fighting prowess. The martial archetype you choose to 
  emulate reflects your approach. 
  Siege Engineer 
  Fighters, widely regarded as the premier experts in 
  weapons and tactics, generally stay away from siege 
  equipment. Most consider that lumbering war machines, 
  which require a large team to move, erect and operate, are 
  best left to ordinary soldiers or specially-trained artillerists. 
  Some, however, take a liking to these mighty engines of 
  destruction and follow the path of the siege engineer. 
       Siege engineers are at the cutting edge of military 
  technology, constantly studying their weapons, refining 
  them, plotting trajectories and looking for weak points in 
  fortifications. Artillery crews led by experienced engineers 
  are far more efficient, being quicker to deploy, more 
  accurate in their attacks and better positioned to defend 
  themselves against counter-attack. 
  Artillery Expert 
  Starting at 3rd level, you can apply your proficiency bonus 
  to any ability check relating to ballistics, siege equipment 
  or siege tactics. Furthermore, when you aim a siege 
  weapon, its attack bonus equals your Intelligence modifier 
  + your proficiency bonus and any save DCs it imposes 
  equals 8 + your Intelligence modifier + your proficiency 
  bonus, unless the default values would be higher. 
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
  Wallbreaker 
  Also at 3rd level, all of your attacks with weapons or siege 
  equipment deal double damage to objects and structures, 
  including those created by spells such as wall of stone. 
  Emplacement 
  By 7th level, you can quickly deploy obstacles and 
  fortifications to defend your siege equipment. You can use 
  a bonus action on your turn to deploy caltrops, ball 
  bearings, hunting traps and any similar devices. 
  Flush Out 
  At 10th level, when you deal damage to a creature on your 
  turn, that creature cannot benefit from any form of cover 
  until the end of its next turn. 
  All-in-One Gun Crew 
  At 15th level, you can use your Extra Attack feature to 
  perform multiple load, aim or fire actions on your turn: you 
  can perform a number of such actions equal to the number 
  of attacks you would normally be able to make. 
  Portable Engines 
  When you reach 18th level, you can disassemble or 
  reassemble a siege engine by working on it for 1 minute. 
  An engine that has been disassembled by you weighs 100 
  pounds and can be fit into man-portable bags and pouches. 
   
  
SOURCE: textdata/thevault/Dungeons & Dragons [multi]/5th Edition (5e)/3rd Party/Mage Hand Press/Siege Engineer.pdf