I found a video on youtube showing a shadower solo bomb krex and get total of 72m exp. I first thought that will well worth my time for bombing but that video is from 2016 and things are different now. I solo bombed krex and here are some of the info I gathered. some info of my char: level135 shadower note: meso explosion damage do not depends on equipments nor stats, it only scale according to ME skill level and meso bombed krex total hp = krex[2] 250m + krex[3] 250m = 500m total time spent: 2hours 38 minutes (I took 5 minutes break between body 2 and 3) total meso spent: approximately 107m total exp gain = krex[2] 26.6m + krex[3] 32m = 57.6m for comparison, hunting bigfoot: bigfoot total hp = 32m total time spent: around 15minutes (without mistake) total meso spent: approximately 7m (without mistake) total exp gain = 8.5m killing 8.77 bigfoot will get around 57.6m exp which is same as 1 full krex, total time needed = 8.77 * 15mins = 2hours 11minutes total meso needed = 8.77 * 7m = 61.39m my conclusion: The only reason I went for this is because of the expected exp gain from krex, however the total exp gained is not as I expected. Now I advise not to solo bomb krex. If you want a krex ring, buy a krex ring service with 35m~40m, you can afk do to something else while waiting seller to kill, and usually they get it down by 40 minutes (depending on eqs). p.s. hand + finger cramp after the krex solo run edit 16/3/20121: my mouse left click spoiled, it sometimes double click and sometimes no response, RIP mouse.