To prevent parasites from random attacks in epic siege, you can use the blacklist function in its configuration file.(Note: This is just the original AI of the parasite)

The following is a biological ID, and you can copy it directly (excluding walking the cranial, because it is not necessary):

 SRPARASITES: ANC_DREADNAUT

srparasites: ANC_Overlord
srparasites: bomber_heavy
srparasites: Wraith
srparasites: Bogle
SRPARASITES: Succor
SRPARASITES: Carrier_Colony
srparasites: haunter
SRPARASITES: Monarch
srparasites: GRunt
srparasites: MarAuder
srparasites: bomber_light
SRPARASITES: Overseer
srparasites: Warden
srparasites: vigirante
srparasites: ada_longarms
SRPARASITES: ada_manducater
srparasites: ada_reeker
SRPARASITES: ada_yelloweye
SRPARASITES: ada_summoner
SRPARASITES: ada_bolster
srparasites: ada_arachnida
srparasites: pri_tozoon
srparasites: pri_vermin
srparasites: pri_devourrr
srparasites: pri_arachnida
srparasites: pri_bolster
srparasites: pri_summoner
srparasites: pri_yelloweye
srparasites: pri_reeker
srparasites: pri_manducater
srparasites: pri_longarms
srparasites: hi_blaze
srparasites: hi_golem
srparasites: hi_skeleton
srparasites: Fer_horse
srparasites: Fer_villager
srparasites: Fer_sheep
srparasites: Fer_human
srparasites: FER_PIG
srparasites: Fer_wolf
srparasites: Fer_nderman
srparasites: FER_COW
srparasites: FER_BEAR
SRPARASITES: Carrier_flying
SRPARASITES: Carrier_heavy
SRPARASITES: Carrier_light
srparasites: mangler
srparasites: Rupter
srparasites: buglin
SRPARASITES: Gnat
srparasites: worte
srparasites: Dispatcherten
srparasites: seizer
srparasites: Sentry
srparasites: kyphosis
srparasites: Dispatcher_SIV
srparasites: Dispatcher_SIII
srparasites: Dispatcher_SII
SRPARASITES: Dispatcher_SI
srparasites: Beckon_siv
srparasites: Beckon_siii
srparasites: Beckon_sii
srparasites: Beckon_SI
SRPARASITES: Thrall
srparasites: hostii
srparasites: heed
srparasites: CRUX
srparasites: host
srparasites: Incompleteform_smallsrparasites: Incompleteform_Medium
srparasites: MovingFlesh
srparasites: ANC_DREADNAUT_TEN
srparasites: Source
SRPARASITES: Tendril
srparasites: biomass
srparasites: ANC_POD
srparasites: Sim_enderman
srparasites: SIM_BEAR
srparasites: SIM_HORSE
srparasites: SIM_ADVENTURER
srparasites: SIM_VILLAGER
srparasites: SIM_PIG
srparasites: SIM_WOLF
srparasites: SIM_SHEEP
srparasites: SIM_COW
srparasites: Sim_human
srparasites: Sim_squid
srparasites: Sim_bigspider
srparasites: Sim_dragone