Here is some news on how Goduma active is Working right now on itos:
1º - The initial damage reduction is now based on your Max health on cast. It means that NOW its possible to hit the 50%(60% with seal lvl 3) cap with max health buffs;
2º - The damage reduction decays at 2% per second, with a max duration of 20s, this means that to be able to reach max duration you will need more than 40% initial damage reduction;
3º - There is a bug where the active effect will not work inside instances like Unique/Legend Raids or daily Dungeons but still works in pvp areas like TBL(Already send a ticket about this one);
Overall i can tell you that this prefix is usable now. I liked and i will stick with it for some time;