Formal language, for starters.
You also haven't used enough detail. "The armor comes complete with gauntlets, lower leg armor, helmet, upper body armor and a sword." This doesn't tell me anything about it, it could include lining of bear skin for all I know. "after the armor fell out of the back of it's transport vehicle and collided with a dump truck stopping it instantly." This doesn't happen as much as you'd think. Stuff doesn't just fall out like that. Besides, wouldn't SCP-1338 of weighed down the transport vehicle? Seeing as it can stop a dump truck, I'd imagine so. You also wrote "No effect". This is probably the most bland thing you could write in an addendum and as a result the highly critical community of SCP probably rolled their eyes and downvoted. Write exactly what happened instead. Test 4: You just wrote [DATA EXPUNGED]. Add a little bit more detail to give the reader some sort of an idea of what the hell happened.