abomination is able to take on bandits alone and gets more allies with every kill as well as being able to actually take on end game enemies the sirens actually get curb stomped by hobgoblins or other fast attacking high damage enemies like abomination managers
also the ability to get more sta off devouring corpses is really powerful and easily turns a fight in your favour and the tentacle whip is actually able to push your attack high enough to kill abomination tentacles without a saber
If you keep spawning them they eventually deal with hobgoblins, they're highly mobile by juming on the ennemies and deal a lot of damage. I usually deal with full band of bandits with them. Tentacle whips are immobiles unlike them, plus they only cost 10 STA which is very little, you can whipe out an entire band of ennemies with only 4/5 of them.
desecrated tentacles attack in a 2 space line and their health and defense as well as aggressiveness scales depending on what enemy was used to create them as well as them being immune to injuries and only taking 1 sta to create they can usually keep most distracted while you pick them off one by one and continue adding more tentacles to the mix also 10 sta is an obscene amount of stamina to be spending on something thats going to get promptly messed up again consider the highest stamina cost in the game for weapons is the saint sym at 5 sta or the great sword at 6 sta with a full spin attack
With 10 stamina you've an ally as strong as a city guard who can automatically jump on ennemy, it's far from a promply messed pnj. For 50/60 staminas I usually wipe out any band of bandits and sirens can even solo orcs. But if it's not enough, as a deepone you can kill them with range spell who are quicker than arrow while dealing as much damage and as all ennemies are sexually attracted by you, when they'll spot you they will usually masturbate instead of fighting you at least until you attack them.