The bosses Gelidrazah the Frozen and Zorvorax might not be a problem since you kill them using energy walls to be safe, so any Paladin level 100 are able to do it.
The boss Tazhadur walks through the walls and bomob of any element so You'll have to run around the room, It can be done easily since you are not playing with lag. Avoid his fire waves it can deal 600 of damage.
Then big problem is to kill Kalyassa, it because this boss walks through any type of element (bombs/walls) and will summon 2 Dragon Lords to help him at the battle. Because of that I recoomend to be at least lvl 180+ to kill this boss.
Only Kalyassa is Dangerous imo. She might spawn 2 dragon lords and one shot you. I would recommend use magma amulet there and might ring If you are not good paladin at all. Other bosses are easy to do and wont hit much as she does. :)
My experiência with paladin 150 and this Bosses:
Loqhakk - Applying to TibiaQA team as ModeratorJuly 26, 2024
Nareull - Applying to TibiaQA team as ModeratorJuly 14, 2024
Looking for new TibiaQA staff membersJuly 12, 2024