Puna Boss
You'll encounter the Puna Boss in the level Temple of Puna, in Tomb Raider 3 (South Pacific Islands).
The best way to defeat him is to side flip while shooting with the Desert Eagle or the Uzis. You can basically use all weapons, but those are the most effective. It can only be hurt while using its lightning attack or summoning a Lizard, otherwise he is protected by a force field. If the lightning hits you it causes instant death
Every four shots he summons a Lizard.
Powers
He can muster lightening using Element 115. If struck by it, the recipient will suffer instant death. He may also summon lizard beasts to aid him. To defend himself, he can produce a energy barrier around his throne upon which he sits on. However the barrier will not hold when he musters lightening, making himself vunerable to gunfire.