gear: padded armor, silver sword/frostner
strat (and this is why its boring):
He raises his left hand, I run away because the lingering fire (even with fire resist mead) will half my health easy.
He raises his right hand, I run away behind a stone pillar and wait.
He shoots his laser, I run sideways to avoid it.
Rinse repeat till dead.
Thats literally it, and he is a huge damage sponge, so its just the same thing for ages. It's not hard, just boring.
Devs really should consider dropping either his health, or frequency of attacks if vs a solo player. I am spending 90% of the time just running and hiding, and the combat is limited to "hit three times before his next attack forces me to retreat for 10-15 seconds".
Edit: Actually thinking about it, all the boss fights are very mid, but yagluth takes the cake for boring.
Source: https://www.reddit.com/r/valheim/comments/17nqx6e/yagluth_fight_solo_is_very_boring/