https://www.youtube.com/watch?v=EFBO_3zROPY

0:00 - Lokkestiiz - From time to time he will create frozen tomb, u have to stay away from this or u will die unless u heal yourself. There's a small rock on the ground which show the maximum range of frost breath, u can stand beside it to parse the boss, if u want to tank the breath, u have to use blood mist or magma armor or u will die.

At certain hp he will fly away and poop some atronach, u need to kill the storm atronach and make those ice atronach stand in the circle of storm atronach drop. Make sure to block attack from dragon's laser.

At excute phase, a delay aoe will drop on u, keep moving to dodge it or u will be stun. Repeat until the boss is dead !

It's impossible to solo the second boss because his fireball will increase dmg each time it hit u and oblivion damage will kill u before his fireball even reach u.

After the first boss, i just sneak around the room and loot all 6-7 chests and lot of heavy sack, very good loot when solo ( got 2 decoration items around 40k gold )
_____________________________________
Build : 1 pc armor + undaunted unweaver + undaunted infiltrator + pale order ring