BR14
Hit against mass hanging on tree.
For this iteration, I'm recording all of the damage in full as you have reported it; and it will stand. For the future, a similar situation may go another way if the rules suggest otherwise. We'll revisit and discuss in the crowd if necessary.
Icky gore, like infested pus, pours to the ground from the wound. The slice also cuts partially through one of the retracted tentacles in the middle of the large mass. The wounded tentacle bursts forth in a thrust, but in full extension it is split along its length the entire way. The two split tentacle lengths pour down, flop and wriggle briefly, then fall inert.
Another fleshy tentacle-like tube burst forth from another site on the flesh mass, to the right of the slash wound. This disgusting extremity extends to a length of about 4 feet and writhes wildly back and forth in the air.
The sight of this unnatural gore is sickening. After lunging forward for the maneuver, with a shove of his lead leg Thorn shifts back to the position from which he launched outward. As he glides backwards away from the tree, a puff of gas sprays out from a vent-like pore that opens on the crusty skin of the horrid flesh mass.
By narrow timing, Thorn withdraws from the spacing that is engulfed in a full cloud of gray-green dust. He is however close to the periphery of the expanding cloud. He cannot completely avoid breathing it in.
Wretched Mass's Reaction Defensive Measure triggered. Thorn must make CON save attempt. Result will determine extent of effects.
Because of Lunge Maneuver follow through that pulls Thorn back from 5' adjacent to 10' spacing, DM circumstance bonus granted.
CON Save should be made at Advantage.
When Thorn's sword splits through the mass of wretched flesh, the masked phantom heaves in pain as he is trying to get up. His back arcs and his head throws back. His arms extend wide and lock out, still holding his blades, but forearms facing up in an unnatural position of pain response.
After this initial jolt, the masked man swoons and careens back and forth, disoriented on his knees, his head now tilted forward, shifting and jerking about.
Final positioning places Thorn 10' back from the tree.
Phantom is on his knees, in the seeming state of shock, 5' to the side of Thorn.
Maeriks is also Prone, also trying to get up, adjacent to the Phantom.
With that, we'll see how the shift to R15 will be set up.