1: Approach tar pit with caution as the blobs are highly aggressive
2: Bait one out and use spring to avoid their projectile attack which they will either use after the leap ability or if they are already in range
3: Kill with mace and then repeat the steps above

1: Lure other enemies to the tar pits to fight the blobs
2: Kill the remaining enemies
3: Get rid of tar and then pick up all the drops

Once you get hit by a volley of the projectiles you need to back away / dodge roll until the slow is gone otherwise you may die - more so if you are fighting multiple tar blobs at a time.