Spoiler:All undead, Arachnodrone included, revive times and corpse HP based on their HP. Bigger undead are harder to destroy but also take much longer to revive. Arachnodrones are especially tanky because they are both Undead and Cyber. Im not gonna change them because
1. They are very slow
2. They are very loud
3. They are slow to attack
4. They have one attack with a very long and obvious telegraph
5. Their attack is easy to dodge if extremely damaging
6. (I don't remember if its this update or next update) They can be totally locked down by melee
The ONLY change Im planning on making is making it more obvious they are Undead.