The barrage of elemental attacks knocks the stormtrooper to the catwalk and sends him skidding backwards almost back to the elevator doors. He roars and heaves himself to his feet, barreling forwards once more, although he is staggering. He hurls his grenade towards Fork, and the explosion catches Nibum and Ttharg as well.
Spoiler: Nibum
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You hear a psionic cry in your head from Goronglix at the last moment and dodge a shard of shrapnel coming at the back of your head.
Cocytus lets out his own roar and charges to meet the shock trooper.
Spoiler: Summary
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ACTIONS: Shock Trooper merges from the elevator and moves 30 feet. Crossbow bolt hits for (19 dmg). Call Lightning (passes save, 11 dmg) knocks him back 10 ft. Firebolt hits (18 dmg) and knocks him prone.
He rises from prone and moves forward 15 feet. Frostbite is triggered and he fails the save (8 dmg). He uses his bonus action Aggressive Movement to get within 60 feet of the back row.
He then uses his action to throw a grenade, which catches Fork, Nibum, Triceratool and Ttharg. (16 dmg, halved on a DC 15 DEX save. Only Fork saves initially (8 dmg); however, Goronglix uses his reaction for Flash of Genius, so Nibum also saves. Triceratool has resistance (8 dmg) but passes the same to Nibum (total of 8+8=16 dmg). Ttharg takes the full damage (16 dmg).
The shock trooper is bloodied. He is 45 feet from Nibum and 60 feet from the back row.
Cocytus moves 30 feet and uses his action to dash, ending toe to toe with the Shock Trooper. He uses his bonus action to shift his hunter's mark.
Goronglix uses his action to maintain control of the station systems (Investigation Check, 9). Elder brain tries to take control (spell attack roll, 17). Goronglix rolls an Int Save to stop it, and uses his reaction on Flash of Genius again to make the save and maintain control.
DAMAGE:
Nibum - 28 damage
Ttharg - 29 damage
Fork - 19 damage
Servius - 0 damage
Triceratool: 14 damage
Rumble - 3 damage
Cocytus - 5 damage
Goronglix - 33 damage
Shock Trooper - 56 damage
INITIATIVE:
22 - Orc Shock Trooper
16 - Fork
15 - Goronglix
11 - Cocytus
8 - Nibum
4 - Ttharg
2 - Servius