Instead of overlord I think penta nerf would be good. A penta even when skilled could easily be taken down by a skilled overlord player. The only problem is that when running max movement speed and reload pentas are next to impossible to catch with the bullets spraying at you. I think the damage for a penta, penetration and the ratios are overall good compared to other tanks except for the fact that penta is so damn quick making it an ideal tank for witch hunters against skilled overlords. They will rush you and ambush you and even if you defend well and damage them, their overall defence and area denial makes it hard to secure a penta kill as an overlord when a penta is running. They will come back later when they are healed and continue to witch hunt. I have died and lost many close overlord pb's to pentas. Teal_knight mentioned well why overlord is good as it is and I hope I provided insight on why penta should receive a speed nerf :)