Kingreaper
Adventurer
That's got nothing to do with house rules, that's the DM being an arbitrary dick. A house rule is a rule, as in, applied consistently: If you roll a 1 on an attack, your cloak blows aside and you take a round's worth of sunlight damage.
The problem with that is the "weakened (save ends)"
If you were weakened only while in sunlight, it wouldn't be too bad. But for a striker, getting "weakened (save ends)" based on your cloak blowing aside is going to really, really, hurt. The 10 damage is unimportant in comparison.
Hopefully there'll be a feat that removes the radiant/sunlight vulnerability, so when playing with GMs who want the cloak to be an unreliable technique, you can just grab that. (Call it Daywalker or something)