MobRegistration

public class MobRegistration {

     public static final DeferredRegister<EntityType<?>> ENTITIES = DeferredRegister.create(ForgeRegistries.ENTITIES, CrystalMain.Mod_ID);

        public static final RegistryObject<EntityType<WeirdMobEntity>> WEIRD_MOB =
                ENTITIES.register("weirdmobentity", () -> EntityType.Builder
                        .<WeirdMobEntity>of(WeirdMobEntity::new, EntityClassification
                        .CREATURE)
                        .sized(0.9f, 0.9f )
                        .build("weirdmobentity"));
}