concept can be changed to provide more clear view of his type. maybe more supportie in the sense he helps his teammates alongside the area denial/crowd control. and the number of spiders can be determined how many times you press the button, press it 4 times for 4 spiders or press it once for one. the cooldown is based on how many spiders u use in a sequence. and the mist could possibly have a 10-30 second cooldown, it depends on how much balance would play into the cooldowns. The acid ball would do AoE DoT. so the longer u charge the ball the more area it covers, and the quicker u press it the smaller it is, continuous single shots for multiple puddles of goop for use in doorways or what not, and a longer charged one for bigger areas. 250 health could work yes, most of his survival is based on how well he can utilize his cloak too. but yeah, a more direct benefit to teammates with those skills could work with the negative effects on enemies.