HK: 5 Vessels

I wish Cornifer were here... He'd have a map and I could sit with him and listen to him humming...
I go back to the elevator and head further up.

You come across a room on the right, it seems empty enough from here.
The elevator also heads further up, if you wish it to.
What do you do?

I head down the room.

A Winged Sentry confronts you.

I leave the room.

Go up?

Go up the elevator.

Now. Please. I don't want to die.

You come across a largish room, largely empty save some platforms leading to an upwards opening to another room, and two vengeflies. A vast window, covering the whole wall, stretches out behind them, giving you a pleasant view of the endless rain falling friskly upon the underground city.
(You get advantage against vengeflies, considering they're low level and you have contact damage.)

I attack the first vengefly with a jump and a slash.
@sansbot roll 2d20

:game_die: 18, 3

The vengefly falters away, heavily damaged but not yet dead-close to it, though. It retaliates.
@sansbot roll 1d20

:game_die: 10

(It's injured so it is debuffed.)
It fails.

I slash it one more time to kill it.
(Can I heal by focusing SOUL or can not all vessels do that(

@sansbot roll 2d20

:game_die: 1, 11

The vengefly lays slain, its geo fallen upon the smooth floor.
You have enough soul to focus.

FOCUS
I focus real hard

You healed one mask.
One vengefly remains above you, not having noticed your presence.