I’ve been maining Boldur since the CTT and I can tell you it is hell trying to learn him (Een more hell then as he was slower and slighty more squishy, runes alternated between sword and shield, and getting health was horrid). I can help you with all the knowledge I’ve know and what’s worked for me. So far my best has been 25-0 with him but I have had a few 21-1, 19-0, and 18-1 games with him. I’ll start with I feel are the best helix choices for him in PvP
Lv1 - Overshield on Boldur Dash
Lv2 - Rage on Boldur Dash
Lvl3 - Being able to dash with your shield
Lv4 - 4 Slow on Axe Toss
Lv5 - Damage reduction mutation on rage (Or if you don’t have that health on rage)
Lvl6 - Damage increased to opponent on axe toss mutation (If you don’t have that then get axe toss damage %15)
Lvl7 - Boldur Dash Cooldown
Lv8 - Melee attack damage
Lv9 - Killing minions or players gives you hp (5 stacks total)
Lv 10 Axe Mastery if you have a miko or root tea legendary, Axe Rune mutation for everything else (gives you 50% health or 100% health based on the runes you already have active when you use runes of power)
Now the idea of boldur is obviously to tank, he is withouth a doubt the best character to hold a lane in the game, even better than broken gallelea. He is also there to get your attackers or support out of pinches until you both can make a retreat. Getting his first levels can be tough and more than likely you will be playing defense and support damage with him until reaching level 3, then things kick up a bit. Clearing Bots, Boldur Dashing oppoents into envirounment walls for stun, and Supporting an attacker by flanking players will me primary jobs. Other jobs around that level are to make sure your attackers have a way out if they go deep, never chase behind an attaker unless their low on life or you know you guys have a way out. If you feel you don’t, Hold position just incase someone tries to flank you and try and boldur dash them out the way if your attacker comes back. By level 5 you are a full on power house and can change the direction of the battle tremendously. When reaching level 5 you can do everything any other melee can do, Harrass, support, straight damage, but he also has the tank ability on top of it. Level 5 Boldur is a force and the last 5 levels will seem like a breeze after the first 5.
When engaged with an opponent NEVEL LOSE YOUR AXE! Your damage output will be extremely greater when your axe is in hand so never lose it The only time you should be using axe throw is when your opponent is garunteed to die from it and they are out of striking range You should always have your Axe throw as ready as possible .
When engaged in a 2v1 ONLY play defense and look for a way out pre lv5. Sneak them in by slowing bringing them towards a turret (With your shield active of course) or another player for the 2v2, or try and escapse completely.
If you are overwhelmed and getting flanked your best option is to boldurdash towards and egress (way out) throw your axe away from you, and run with the 30% dash buff. Teleport to town or use whatever ways you have to get health, and try again.
The equipment you need with Boldur is ATTACK SPEED, ATTACK SPEED, amd ATTACK SPEED. Anything that gives you attack speed (minus the attack speed legendary which doubles if your stationary) is highly recommened and probably the best deal to have with him. Having a low activation for your first attackspeed item (450 shards or less) is highly recommended and will get you killing things alot faster to get the slow early levels out the way.
Hopes this helps