KIINGPUNCH Players that are marine are unable to hurt this mob: summon minecraft:chicken ~ 6 ~ {Tags:["BOSS_chicken"],PersistenceRequired:1,ForgeCaps: {"mineminenomi:entity_stats": {doriki: 6000.0d}}} This issue isn't present in any versions before 0.10.6
KIINGPUNCH A fix is to run this instead: /summon minecraft:chicken ~ 6 ~ {Tags:["BOSS_chicken"],PersistenceRequired:1,ForgeCaps: {"mineminenomi:entity_stats": {faction: "empty", doriki: 6000.0d}}} empty can be replaced with "pirate", if desired.