Dang, those blue phase spiders sure are bad -- cubed !
Sure they are rare, but meeting them is more akin to guaranteed death than anything else. I met phase spiders twice, total. Died twice, too. Despite level 15 and reasonable armor.
EVEN when the player is *perfectly* lined up with their path of attack, odds are good that they will teleport away instantly and thus the player will simply miss his own counterattack. Combined with needing to hit them several times, those guys simply become extremely dangerous!
Would it be possible for their teleportation to take at least a fraction of a second to occur, instead of "instantly after they bite"? Like the spider mob flashes to indicate that it's going to teleport away, so you still get a small window of attack or something. Otherwise, it feels a bit similar to back when Silverfishes gave zero warning and just popped out of stone in order to attack the player instantly, which ended up being automatic damage to the player without capacity to counter in any way. IMHO, there should always be some kind of tactic that the player can use to face off every challenge, instead of "nothing you can do but take lots of damage or even just die".
It's not as if there was some magic or tool that the player could equip that prevented their teleportation or something to turn these encounters more into a "challenge, find the proper way to fight those guys" rather than a straight punitive "there is next to nothing you can do but spam-click the sword and rely on luck" in order to beat these encounters.
A teleporting mob means there is absolutely zero defense that the player can use, as they can just ignore all solid blocks. If the player ALSO can't attack them, except by relying on pure luck, then that mob is just a bad one.
Please improve them somehow, for they still look (and are) kinda cool.