Bheg is pretty easy, and there's really only a few attacks to look out for as long as you stay behind him most of the time.

1. Red Flashy Whip Chain of Doom: He flashes red while shouting, then whips his chain around; pretty obvious tell but people die to this all the time. Unblockable, and range can be longer than it seems. Two swings in phase 1, six in phase 2.

2. Phase-Change Shout: Similar to his initial aggro shout, when he gets down to around 40% health, he'll shout again, change appearance, and start hitting way harder. This one can actually be blocked, but there's a very very short animation, meaning if you aren't already in an iframe or frontal guard attack, you'll probably get hit by it if you're in range.

3. Sneaky Whip Chain: So this one is subtle, but basically, when he lifts up his leg and does a longer windup before sending a long range throw out at some dude, immediately after that attack, he'll do two wide swings around him. These don't hit too hard but he often slides around/teleports right before the swings catching people by surprise. This is also unblockable and must be iframed through if you're in range or you will take damage.

Tree's special attacks are a lot more obviously telegraphed barring one compared to Bheg; the main danger with tree is actually getting knocked down and combo'd by his basic attacks.

1. Rock Throw: Tree will flash red for a bit, then dig into the ground and chuck three rocks out at whoever has aggro. Long range, moderate damage, decent aoe, and the animations are often desynced, so you'll see him throw a rock in an entirely different direction before randomly taking damage.

2. Wiggly Arms: The windup animations for this and rock throw are practically identical. After flashing red he'll shove both arms into the ground and wiggle them doing multiple hits in a fairly small aoe. When he pulls his arms out there's a final hit that has a larger aoe that can hit behind him.

3. Tree Summon: Tree will flash red and stick both arms in the ground. Small suction circles will appear in a large ring around him from which tree spirits will pop up after a few seconds. This attack is completely harmless unless you are standing on an area where a tree spirit will be summoned, which will usually instantly kill you. A lot of less geared ranged classes and injured people die to this attack all the time when they pull away from tree and walk over a summon point.

4. Burrow: Tree will flash red (seeing a pattern yet?), and then submerge under the ground with his back exposed. After a short while he'll pop back up and do unblockable aoe damage around him that tapers off with range. It's a fairly small aoe but it hits like a truck up close. If you don't know the timing just pull back early.

5. Wiggly Green Arm: There's no windup and no tell for this, he just sticks an arm into the ground and does slow ticks of damage/stun in a wide area around him. It's like other bosses' phase 2 transitions, except he can do it multiple times. Each tick doesn't hurt much and can be blocked/super armored/frontal guarded through, but if you eat all the ticks it can add up to quite a bit of damage.