Extracted from the 30 Mecha Design Flaws submission. Edited and reconfigured as a setting neutral piece for use in military aspected settings and most if not all flaws can be used on any vehicle or large piece of hardware.
The 228th Mountain Lion battalion faced a situation not entirely unlike General Custer some 500 years before. Like Custer's men, the 228th was almost completely destroyed, despite their laser cannons and drop ships.
All you need to stop a brain is a bullet.
30 generic problems to dole out for homebrew, custom made, and scratch built machines
The walking siege engines of the Cosmic Era
The Rocky Mountain Republic owes in large it's existence to a single limited run of primitive mechs, the Assault/Bombard Mech model 1.
Technology in the Cosmic Era can become corrupted and infested. When this happens to a mecha, the result in codenamed a Hekatonkheire.
The home base of the mighty mech
The reasons that mecha are not reliable as weapons of war are manifold, but the world changed more than many people expected and the way wars are fought have changed greatly since the middle of the Petroleum Era.
A common light mech of the Atlantic Federation
The ultra minimalism mech, for the common consumer
While technically alive, magnagogs have little in the way of personality and are driven via telepathic command.
The Sogans were a mystically aware technological society. Queen Stavarang is the last surviving Sogan in the galaxy
The PCs encounter an elaborate trap room, designed to fill with water, drowning those inside. Clever and resourceful, they disable the trap and move on.
Only later do they discover that this room is part of the elaborate cooling system that prevents beasts of elemental fire from overrunning the complex. While the fiery beasts run rampant, they begin setting fires, which causes the complex to become increasingly hot and smoke-filled. Additionally, the PCs now have to fight their way out past aggressive fire creatures...