Jeevok ignores the tentacles and moves straight to the main body, attacking it with his Sun Blade. Realizing the beast could deal a lot of damage to his party if it starts moving those tentacles, he positions himself as close to its eyes as he can, in order to intimidate it.

Spoiler: OOC
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Action: Attack

Rolls: 25/18/22
Damage: 11/11/12 (not counting radiant which I assume doesn't apply)

Menacing Attack: 6 damage