It is not a boss battle but its a tough fight for a normal encounter because you are put in a bad spot and surrounded by 5 skeletons + 1 voidwoken deep dweller once you are deep into the area.
♦ What you need to do is activating stealth mode on all four characters. Then put them all up on the high ground on the left , by doing this you wont trigger the ambush until you're out of stealth mode.
♦ Dont stay too close at the edge so enemies wont have a clear line of fire. Any enemies who cant hit you from afar will try to climb up and fight at close range instead. All you need to do is hold up there and kill any skeletons that come close.
♦ The voidwoken drillworm will be unable to use it Chain Lightning , it will try to go around and reach you instead, usually take it 1 turn. Once the Dweller is near , use Earth spell to reduce it AP so it cant blink to your spot and spit Chain Lightning at the same time.
♦ You can also send your fighters and hold the Dweller down there. It doesnt have alot of physical armor (~ 100+) so your fighters should be fine.
--------------------------------------------------------------------- Because my ranged characters were having Glass-Cannon so i use a slightly different approach in the video, its also quite effective.
♦ Send your archer and mage to stay far away from the area and remain in stealth mode throughout first turn of the ambush, only to join the battle once all skeletons finished thier actions.
♦ While your fighters pull the skeletons to thier location, ranger and mage flank the Voidwoken Deep Dweller, a Snipe would destroy it physical armor then an Impalement follow up after by the mage should render it useless for that turn (Crippled & Slowed). Finish it next turn then proceed to aid your fighters.
