The Spiderlings have 2 abilities, both of which have absolutely no feedback for the player besides status debuffs.

Both of them could make use of some particles, and Spawn Spiderite could make use of a spawn sound and effect, similar to Spawn Spiderlings, but much more subtle.

Here are suggested effects for both abilities.
* Poison Sting uses a similar effect to Orb of Venom.
* Spawn Spiderite places green glowing orbs on the target, similar to Spawn Spiderlings, but smaller.
* Also, when the target dies while debuffed, a burst sound plays and some blood splatters out of it.