Mecrov disabled Onu-matoran\
picture with him using his staff as a blade
mecrov was friends with a toa of stone during the toa-dark hunter war. due to his relationship with the toa he was kidnapped by the dark hunters and used as bait to lure in the toa. when they captured the toa they held mecrov in a torture device and if the toa did nit reveal the information they wanted they would remove a limb. well it only took the removing mecrov's left leg for the toa to reveal false information. when they got the info they killed the toa and let mecrov go reminding him to never cross the dark hunters.
since then he has had a very simple artificial leg added and now uses a staff that can double as a blade when needed.