I've been enjoying ESO (bugs aside) and have been playing solo with a dual wield Nightblade focusing on stealth attacks and have been progressing well. I've been able to take out higher level opponents, even trolls and giants, fairly quickly but do tend to come unstuck with groups of more than 3 MOBS (less if they're particularly big and mean). I've tended to go with a stealth attack following by a flurry of dual wield skills, dropping back into invisibility occasionally to gain other bonuses.

However, I recently tagged onto a group of players doing the Lost Village public dungeon + in Coldharbour (groups of around 6+ MOBS) and watched one chap, a level lower than myself, go in against these single handed and hardy break a sweat. The first attack seemed to be a bow scatter/incendiary shot (which pretty much halved the MOBs' health) followed by him charging in and setting off some sort of flame burst which pretty much finished them all off; he was in plate armour with a big sword and anything left standing went down pretty much straight away (and there were lots of bats too on occasion so I suspect he might have been a vampire as well)! At best I could have taken down 2 or 3 MOBS before becoming mincemeat.

I don't seem to have many mass effect skills available (ultimates are okay but can't be used continually) and I haven't focussed on the bow as once an attack (mass effect or otherwise) is launched you loose your stealth bonus. I'm currently level 48, how long would it take to bring bow skills up to a usable level?